{"id":7203,"date":"2026-07-02T01:47:53","date_gmt":"2026-07-02T01:47:53","guid":{"rendered":"http:\/\/australianholden.com\/?p=7203"},"modified":"2026-07-02T01:47:58","modified_gmt":"2026-07-02T01:47:58","slug":"best-coolants-for-classic-holdens","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/07\/02\/best-coolants-for-classic-holdens\/","title":{"rendered":"Best Coolants for Classic Holdens"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">When most people think about maintaining a classic Holden, they focus on engine oil, ignition components or fuel systems. Yet one of the most important fluids in any early Holden is often overlooked: coolant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re driving a 48-215, FJ, FE, FC, FB, EK, EJ, EH, HD, HR, HK, HT or HG, the cooling system plays a critical role in protecting the engine from overheating, corrosion and long-term damage. Unfortunately, many classic Holdens are still running outdated coolant, plain water, or incompatible modern coolant formulations that can actually cause problems rather than prevent them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is that modern coolant technology offers significantly better protection than anything available when these cars were new. Choosing the right coolant can improve cooling efficiency, reduce corrosion and help preserve expensive components such as radiators, heater cores, water pumps and cylinder heads.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why Coolant Is So Important<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many early Holden owners grew up in an era where topping up the radiator with tap water was considered normal practice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While that may have worked decades ago, it&#8217;s a habit that has contributed to countless cooling system failures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper coolant performs several critical functions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transfers heat away from the engine<\/li>\n\n\n\n<li>Prevents corrosion<\/li>\n\n\n\n<li>Lubricates the water pump<\/li>\n\n\n\n<li>Reduces scale build-up<\/li>\n\n\n\n<li>Raises boiling point<\/li>\n\n\n\n<li>Lowers freezing point<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without adequate coolant protection, rust and corrosion can quickly begin attacking the internal passages of the engine and radiator.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Cooling System Problems in Classic Holdens<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One reason coolant choice is so important is that many classic Holdens already suffer from age-related cooling system issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common problems include:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rust inside engine water jackets<\/li>\n\n\n\n<li>Blocked radiator cores<\/li>\n\n\n\n<li>Corroded heater cores<\/li>\n\n\n\n<li>Water pump wear<\/li>\n\n\n\n<li>Sediment build-up<\/li>\n\n\n\n<li>Overheating<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Using the correct coolant won&#8217;t repair existing damage, but it can significantly slow future deterioration.<\/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 enthusiasts still run plain water in their cooling systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While water transfers heat effectively, it provides virtually no protection against corrosion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Risks include:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal rust formation<\/li>\n\n\n\n<li>Electrolysis damage<\/li>\n\n\n\n<li>Water pump wear<\/li>\n\n\n\n<li>Scale build-up<\/li>\n\n\n\n<li>Reduced cooling system lifespan<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even vehicles driven only occasionally should use a quality coolant mixture.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">What Type of Coolant Does a Classic Holden Need?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Classic Holdens use materials that differ significantly from modern vehicles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most Grey Motor and Red Motor Holdens feature:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cast iron engine blocks<\/li>\n\n\n\n<li>Cast iron cylinder heads<\/li>\n\n\n\n<li>Brass radiators<\/li>\n\n\n\n<li>Copper radiator cores<\/li>\n\n\n\n<li>Soldered joints<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because of this, coolant compatibility is important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The best coolant for a modern aluminium engine isn&#8217;t always the best choice for a classic Holden.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Overall Coolant for Classic Holdens<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Penrite Classic Car Coolant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Penrite has built a strong reputation among Australian enthusiasts, and their Classic Car Coolant is specifically formulated for older vehicles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why it&#8217;s recommended<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Designed for classic cooling systems<\/li>\n\n\n\n<li>Suitable for copper and brass radiators<\/li>\n\n\n\n<li>Corrosion inhibitors protect older metals<\/li>\n\n\n\n<li>Compatible with cast iron engines<\/li>\n\n\n\n<li>Australian conditions tested<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is often considered the safest all-round choice for Grey Motor and Red Motor Holdens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Best for<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stock restorations<\/li>\n\n\n\n<li>Weekend cruisers<\/li>\n\n\n\n<li>Show cars<\/li>\n\n\n\n<li>Long-term ownership<\/li>\n<\/ul>\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 Classic Car 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 Classic Car Coolant\",\nfu_ebay_query : \"Penrite Classic Car 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 Modified Holdens<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many modified Holdens generate more heat than their factory counterparts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Triple carburettor setups<\/li>\n\n\n\n<li>Performance camshafts<\/li>\n\n\n\n<li>High-compression engines<\/li>\n\n\n\n<li>V8 conversions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These combinations often benefit from higher-performance cooling products.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nulon Long Life Coolant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A popular choice among enthusiasts running modified engines.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent heat transfer<\/li>\n\n\n\n<li>Corrosion protection<\/li>\n\n\n\n<li>Long service intervals<\/li>\n\n\n\n<li>Suitable for upgraded cooling systems<\/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>Modified Grey Motors<\/li>\n\n\n\n<li>Warm Red Motors<\/li>\n\n\n\n<li>Engine conversion projects<\/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;Nulon Long Life Coolant<\/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 : \"Nulon Long Life Coolant\",\nfu_ebay_query : \"Nulon Long Life 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 Budget Coolant<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Not every Holden owner needs a premium coolant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For regularly serviced vehicles, a quality budget-friendly coolant can still provide excellent protection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tectaloy 90 Plus Coolant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of Australia&#8217;s most widely used coolants.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Affordable<\/li>\n\n\n\n<li>Readily available<\/li>\n\n\n\n<li>Effective corrosion protection<\/li>\n\n\n\n<li>Suitable for older vehicles<\/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>Daily drivers<\/li>\n\n\n\n<li>Budget-conscious owners<\/li>\n\n\n\n<li>Regularly maintained vehicles<\/li>\n<\/ul>\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;Tectaloy 90 Plus 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 : \"Tectaloy 90 Plus Coolant\",\nfu_ebay_query : \"Tectaloy 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 Additive<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">In some cases, owners want to improve cooling system performance without completely changing coolant types.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Red Line Water Wetter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A favourite among performance enthusiasts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improves heat transfer<\/li>\n\n\n\n<li>Reduces operating temperatures<\/li>\n\n\n\n<li>Enhances cooling efficiency<\/li>\n\n\n\n<li>Suitable alongside coolant<\/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>Performance applications<\/li>\n\n\n\n<li>Vehicles used in hot climates<\/li>\n\n\n\n<li>Modified engines<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many enthusiasts report noticeable temperature reductions after installation.<\/p>\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;Red Line Water Wetter<\/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. 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Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_4 = jQuery(\"#fu_ebay_4\");\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 Radiator Flush\",\nfu_ebay_query : \"Nulon Radiator Flush\",\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 : 4,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_4.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\">Coolant Colours Explained<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners assume coolant colour determines compatibility.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In reality, colour varies between manufacturers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common colours include<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Green<\/li>\n\n\n\n<li>Red<\/li>\n\n\n\n<li>Blue<\/li>\n\n\n\n<li>Yellow<\/li>\n\n\n\n<li>Orange<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Always follow manufacturer specifications rather than relying solely on colour.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mixing different coolant types should generally be avoided.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">How Often Should Coolant Be Changed?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Even the best coolant eventually degrades.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For most classic Holdens:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended intervals<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Every 2 to 5 years depending on product<\/li>\n\n\n\n<li>Immediately if contamination occurs<\/li>\n\n\n\n<li>Following major cooling system repairs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fresh coolant provides better protection than coolant left in service for decades.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Signs Your Coolant Needs Replacing<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Watch for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brown coolant<\/li>\n\n\n\n<li>Rust particles<\/li>\n\n\n\n<li>Cloudy appearance<\/li>\n\n\n\n<li>Overheating<\/li>\n\n\n\n<li>Coolant smell<\/li>\n\n\n\n<li>Visible contamination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These symptoms often indicate the cooling system requires attention.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Cooling System Maintenance Tips<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">To maximise cooling system life:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Regularly inspect<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator hoses<\/li>\n\n\n\n<li>Hose clamps<\/li>\n\n\n\n<li>Water pump<\/li>\n\n\n\n<li>Thermostat<\/li>\n\n\n\n<li>Radiator cap<\/li>\n\n\n\n<li>Coolant condition<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Preventative maintenance is significantly cheaper than repairing an overheated engine.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Coolant Mistakes<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Using Plain Water<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Still one of the biggest mistakes made by classic car owners.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mixing Different Coolants<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Can reduce effectiveness and sometimes create unwanted chemical reactions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Coolant Age<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even vehicles driven rarely require periodic coolant replacement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Skipping System Flushes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Old contaminants can reduce the effectiveness of fresh coolant.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Final Thoughts<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The right coolant does far more than simply prevent overheating. It protects the entire cooling system from corrosion, lubricates critical components and helps preserve expensive parts that are becoming increasingly difficult to replace.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For most Grey Motor and Red Motor Holdens, Penrite Classic Car Coolant remains one of the safest and most effective choices available. Modified vehicles may benefit from products such as Nulon Long Life Coolant or additives like Red Line Water Wetter, while budget-conscious owners can still achieve excellent protection with products such as Tectaloy 90 Plus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whatever coolant you choose, the most important factor is maintaining a clean cooling system and replacing coolant at appropriate intervals. A small investment in quality coolant today can prevent thousands of dollars in engine and radiator repairs tomorrow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Early Holden Cooling System Problems<\/li>\n\n\n\n<li>Early Holden Radiator Upgrade Guide<\/li>\n\n\n\n<li>Holden Grey Motor Issues Explained<\/li>\n\n\n\n<li>Best Oils for Early Holden Engines<\/li>\n\n\n\n<li>Best Thermostats for Classic Holdens<\/li>\n\n\n\n<li>How to Inspect an Early Holden Before Buying<\/li>\n\n\n\n<li>Best Electric Fan Upgrades for Early Holdens<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When most people think about maintaining a classic Holden, they focus on engine oil, ignition components or fuel systems. Yet one of the most important fluids in any early Holden is often overlooked: coolant. Whether you&#8217;re driving a 48-215, FJ, FE, FC, FB, EK, EJ, EH, HD, HR, HK, HT or HG, the cooling system [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3482,"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-7203","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 Classic Holdens - Australian Holden<\/title>\n<meta name=\"description\" content=\"Whether you&#039;re driving a 48-215, FJ, FE, FC, FB, EK, EJ, EH, HD, HR, HK, HT or HG, the cooling system plays a critical role in protecting the engine from overheating, corrosion and long-term damage.\" \/>\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-classic-holdens\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Best Coolants for Classic Holdens - Australian Holden\" \/>\n<meta property=\"og:description\" content=\"Whether you&#039;re driving a 48-215, FJ, FE, FC, FB, EK, EJ, EH, HD, HR, HK, HT or HG, the cooling system plays a critical role in protecting the engine from overheating, corrosion 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