{"id":7356,"date":"2026-07-02T03:31:02","date_gmt":"2026-07-02T03:31:02","guid":{"rendered":"http:\/\/australianholden.com\/?p=7356"},"modified":"2026-07-02T03:31:07","modified_gmt":"2026-07-02T03:31:07","slug":"best-coolants-for-old-commodore-engines","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/07\/02\/best-coolants-for-old-commodore-engines\/","title":{"rendered":"Best Coolants for Old Commodore Engines"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Choosing the right coolant is one of the most important yet overlooked aspects of maintaining a classic Commodore. Whether you own a VB, VC, VH, VK, VL, VN or VP Commodore, the cooling system relies on quality coolant to prevent overheating, corrosion and costly engine damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many older Commodores still use original engine blocks, radiators, heater cores and water pumps that are now decades old. Using the wrong coolant\u2014or worse, plain water\u2014can accelerate corrosion, cause internal blockages and significantly shorten the lifespan of cooling system components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fortunately, modern coolants offer far better protection than the products available when these cars were new. Selecting the correct coolant can improve cooling performance, reduce maintenance costs and help preserve your classic Holden for years to come.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why Coolant Is Important<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many people think coolant simply prevents overheating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In reality, it performs several critical functions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Coolant Helps:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transfer heat<\/li>\n\n\n\n<li>Prevent corrosion<\/li>\n\n\n\n<li>Lubricate the water pump<\/li>\n\n\n\n<li>Reduce scale build-up<\/li>\n\n\n\n<li>Protect aluminium components<\/li>\n\n\n\n<li>Prevent freezing and boiling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without proper coolant, the entire cooling system suffers.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why Plain Water Is a Bad Idea<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Some older Commodores spend years running on plain tap water.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This creates numerous problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Issues<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal rust<\/li>\n\n\n\n<li>Blocked radiators<\/li>\n\n\n\n<li>Water pump wear<\/li>\n\n\n\n<li>Heater core corrosion<\/li>\n\n\n\n<li>Engine block sediment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even vehicles driven infrequently benefit from proper coolant protection.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Which Commodore Engines Need Coolant Protection?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Every Commodore engine benefits from quality coolant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Engines<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>2.85-litre Holden six<\/li>\n\n\n\n<li>3.3-litre Blue Motor<\/li>\n\n\n\n<li>3.3-litre Black Motor<\/li>\n\n\n\n<li>4.2-litre Holden V8 (253)<\/li>\n\n\n\n<li>5.0-litre Holden V8 (308)<\/li>\n\n\n\n<li>VL Nissan RB30 six<\/li>\n\n\n\n<li>VN-VP Buick V6<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each engine contains metal components that can suffer corrosion.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">What Makes a Good Coolant?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The best coolant should provide:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion protection<\/li>\n\n\n\n<li>Long service life<\/li>\n\n\n\n<li>Aluminium compatibility<\/li>\n\n\n\n<li>Scale resistance<\/li>\n\n\n\n<li>Water pump lubrication<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cheap coolants often provide limited protection.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Overall Coolant for Old Commodores<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Penrite OEM Coolant Premix<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Penrite has become one of Australia&#8217;s most trusted lubricant and coolant manufacturers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent corrosion protection<\/li>\n\n\n\n<li>Suitable for mixed-metal cooling systems<\/li>\n\n\n\n<li>Long service intervals<\/li>\n\n\n\n<li>Australian-developed formulation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VB Commodore<\/li>\n\n\n\n<li>VC Commodore<\/li>\n\n\n\n<li>VH Commodore<\/li>\n\n\n\n<li>VK Commodore<\/li>\n\n\n\n<li>VL Commodore<\/li>\n\n\n\n<li>VN and VP Commodore<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Stands Out<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It provides excellent protection for older cast-iron engines and ageing cooling systems.<\/p>\n\n\n<div id=\"fu_ebay_0\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 0 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_0\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Penrite OEM Coolant<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_0 = null;\nvar waitForDepends_fu_ebay_0 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_0);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_0 = jQuery(\"#fu_ebay_0\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Penrite OEM Coolant\",\nfu_ebay_query : \"Penrite OEM Coolant\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for Holden Blue Motor Engines<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Penrite Classic Coolant Green<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Blue motor engines contain significant cast-iron components that benefit from traditional inhibitor technology.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Designed for older vehicles<\/li>\n\n\n\n<li>Corrosion protection<\/li>\n\n\n\n<li>Suitable for brass and copper radiators<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VB Commodore<\/li>\n\n\n\n<li>VC Commodore<\/li>\n\n\n\n<li>VH Commodore<\/li>\n\n\n\n<li>VK Commodore<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Ideal Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Original restorations<\/li>\n\n\n\n<li>Weekend cruisers<\/li>\n\n\n\n<li>Stock cooling systems<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_1\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 1 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_1\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Penrite Classic Coolant Green<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_1 = null;\nvar waitForDepends_fu_ebay_1 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_1);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_1 = jQuery(\"#fu_ebay_1\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Penrite Classic Coolant Green\",\nfu_ebay_query : \"Penrite Classic Coolant\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 1,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_1.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for Holden 253 and 308 V8s<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Nulon Long Life Green Coolant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Holden V8s generate significant heat and benefit from premium coolant protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Long service intervals<\/li>\n\n\n\n<li>Excellent corrosion resistance<\/li>\n\n\n\n<li>Improved cooling system longevity<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Holden 253 V8<\/li>\n\n\n\n<li>Holden 308 V8<\/li>\n\n\n\n<li>Performance applications<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why Owners Choose It<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Its inhibitor package provides strong protection for older cast-iron engines.<\/p>\n\n\n<div id=\"fu_ebay_2\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 2 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_2\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Nulon Long Life Green Coolant <\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_2 = null;\nvar waitForDepends_fu_ebay_2 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_2);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_2 = jQuery(\"#fu_ebay_2\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Nulon Long Life Green Coolant \",\nfu_ebay_query : \"Nulon Long Life Green Coolant \",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 2,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_2.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for VL Commodore RB30 Engines<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The Nissan RB30 introduced aluminium components into the Commodore range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Product: Penrite Red OEM Coolant<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aluminium protection<\/li>\n\n\n\n<li>Long-life formula<\/li>\n\n\n\n<li>Excellent heat transfer<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VL Commodore RB30<\/li>\n\n\n\n<li>Turbocharged applications<\/li>\n\n\n\n<li>Modified engines<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_3\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 3 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_3\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Penrite Red Coolant<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_3 = null;\nvar waitForDepends_fu_ebay_3 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_3);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_3 = jQuery(\"#fu_ebay_3\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Penrite Red Coolant\",\nfu_ebay_query : \"Penrite Red Coolant\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 3,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_3.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for VN and VP Buick V6 Engines<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The Buick V6 cooling system requires modern corrosion protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Product: Nulon Red Long Life Coolant<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suitable for aluminium components<\/li>\n\n\n\n<li>Extended service life<\/li>\n\n\n\n<li>Excellent corrosion resistance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VN Commodore<\/li>\n\n\n\n<li>VP Commodore<\/li>\n\n\n\n<li>Daily drivers<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_4\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 4 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_4\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Penrite Red Coolant<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_4 = null;\nvar waitForDepends_fu_ebay_4 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_4);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. 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the safest option.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">When Should Coolant Be Replaced?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Coolant does not last forever.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typical Service Intervals<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Traditional coolant:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Every 2 years<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Long-life coolant:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Every 5 years<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Always follow manufacturer recommendations.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Signs Your Coolant Needs Replacing<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Rusty Appearance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Indicates corrosion inside the system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Brown Coolant<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suggests contamination or internal rust.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sludge Formation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Can block radiators and heater cores.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cooling System Corrosion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Often visible around radiator necks and fittings.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Cooling System Flushes<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before changing coolant, consider performing a complete system flush.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Removes sediment<\/li>\n\n\n\n<li>Improves coolant flow<\/li>\n\n\n\n<li>Restores cooling efficiency<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A flush is especially important if coolant history is unknown.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Cooling System Flush<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Nulon Radiator Flush<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Removes scale<\/li>\n\n\n\n<li>Cleans cooling passages<\/li>\n\n\n\n<li>Improves heat transfer<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Older cooling systems<\/li>\n\n\n\n<li>Unknown maintenance history<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_5\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 5 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_5\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Nulon Radiator Flush <\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_5 = null;\nvar waitForDepends_fu_ebay_5 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_5);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. 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Whether you own a blue motor-powered VH, a VK V8, a VL RB30 or a VN V6, proper coolant maintenance helps prevent overheating, corrosion and expensive repairs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many cooling system failures in older Commodores can be traced back to neglected coolant, internal corrosion or incorrect coolant selection. Fortunately, modern products from manufacturers such as Penrite and Nulon provide excellent protection for both original and restored cooling systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing coolant at the correct intervals and using the right product will help keep your Commodore running cool and reliable for many years to come.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VB VC VH VK Commodore Cooling System Problems<\/li>\n\n\n\n<li>VB VC VH VK Radiator Replacement Guide<\/li>\n\n\n\n<li>Holden 253 &amp; 308 V8 Issues Explained<\/li>\n\n\n\n<li>Holden Blue Motor Issues Explained<\/li>\n\n\n\n<li>Best Cooling Upgrades for Classic Commodores<\/li>\n\n\n\n<li>How to Inspect an Early Commodore Before Buying<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Choosing the right coolant is one of the most important yet overlooked aspects of maintaining a classic Commodore. Whether you own a VB, VC, VH, VK, VL, VN or VP Commodore, the cooling system relies on quality coolant to prevent overheating, corrosion and costly engine damage. Many older Commodores still use original engine blocks, radiators, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-7356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Best Coolants for Old Commodore Engines - Australian Holden<\/title>\n<meta name=\"description\" content=\"Choosing the right coolant is one of the most important yet overlooked aspects of maintaining a classic Commodore.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/2026\/07\/02\/best-coolants-for-old-commodore-engines\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Best Coolants for Old Commodore Engines - Australian Holden\" \/>\n<meta property=\"og:description\" content=\"Choosing the right coolant is one of the most important yet overlooked aspects of maintaining a classic Commodore.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/australianholden.com\/index.php\/2026\/07\/02\/best-coolants-for-old-commodore-engines\/\" \/>\n<meta property=\"og:site_name\" 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