{"id":2308,"date":"2026-03-19T07:13:26","date_gmt":"2026-03-19T07:13:26","guid":{"rendered":"http:\/\/australianholden.com\/?p=2308"},"modified":"2026-05-08T10:06:58","modified_gmt":"2026-05-08T10:06:58","slug":"the-one-commodore-repair-that-can-write-off-the-car","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/03\/19\/the-one-commodore-repair-that-can-write-off-the-car\/","title":{"rendered":"The One Commodore Repair That Can Write Off the Car"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">For many Australians, the Holden Commodore represents affordable power, space, and familiarity. But there\u2019s one repair\u2014particularly in Alloytec V6\u2013powered Commodores\u2014that has quietly written off more cars than blown head gaskets or failed transmissions ever have: timing chain replacement.<\/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;Head Gasket<\/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 : \"Head Gasket\",\nfu_ebay_query : \"Holden Head Gasket\",\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<p class=\"wp-block-paragraph\"><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/commodores\/vz-commodore\/vz-commodore-specifications\/\" type=\"page\" id=\"232\">VZ Commodore Specifications<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why the Alloytec Timing Chain Is Such a Big Deal<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Alloytec V6 engine (commonly found in VZ, VE and early VF Commodores) uses a timing chain system, not a timing belt. On paper, timing chains are designed to last the life of the engine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In reality, Alloytec timing chains are prone to premature stretching, particularly in engines that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Miss oil changes<\/li>\n\n\n\n<li>Run extended service intervals<\/li>\n\n\n\n<li>Operate in high-heat, stop-start conditions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once the chain stretches, engine timing drifts out of spec\u2014and everything starts to unravel.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-amazon wp-block-embed-amazon\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"for Holden Timing Chain Kit + Gears Commodore VZ Statesman WL 3.6L V6 04-08\/2006\" type=\"text\/html\" width=\"580\" height=\"550\" frameborder=\"0\" allowfullscreen allow=\"clipboard-write\" style=\"max-width:100%\" src=\"https:\/\/read.amazon.com.au\/kp\/card?asin=B07GZ9MH6R\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Early Warning Signs Most Owners Miss<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is why the repair becomes so expensive: owners often don\u2019t act early.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common early symptoms include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check engine light (often intermittent)<\/li>\n\n\n\n<li>Rough idle or hesitant acceleration<\/li>\n\n\n\n<li>Increased fuel consumption<\/li>\n\n\n\n<li>Rattle on cold start<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because the car usually still drives \u201cfine,\u201d the problem gets ignored. Unfortunately, timing chain wear is progressive and irreversible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why This Repair Is So Expensive<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Timing chain replacement on an Alloytec V6 is labour-intensive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The engine must be partially disassembled to access:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primary and secondary timing chains<\/li>\n\n\n\n<li>Chain guides<\/li>\n\n\n\n<li>Hydraulic tensioners<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Typical Cost in Australia<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>$2 500\u2013$4 000 for a full timing chain replacement<\/li>\n\n\n\n<li>More if additional damage is found<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For many high-kilometre Commodores worth $4 000\u2013$6 000, this single repair can exceed the market value of the car.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Happens If You Don\u2019t Fix It<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is where the real danger lies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ignoring a stretched timing chain can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Severe misfiring<\/li>\n\n\n\n<li>Valve timing jumping teeth<\/li>\n\n\n\n<li>Bent valves<\/li>\n\n\n\n<li>Piston damage<\/li>\n\n\n\n<li>Complete engine failure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">At that point, you\u2019re no longer looking at a repair\u2014you\u2019re looking at:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>$6 000\u2013$9 000 for an engine rebuild<\/li>\n\n\n\n<li>Or scrapping the vehicle entirely<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">That\u2019s why this repair so often writes off the car financially, even if it\u2019s still drivable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why This Issue Is So Common in Commodores<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several factors stack the odds against Alloytec engines:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Long factory oil change intervals<\/li>\n\n\n\n<li>Oil quality sensitivity<\/li>\n\n\n\n<li>High operating temperatures<\/li>\n\n\n\n<li>High mileage (often 150 000\u2013250 000km)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once chain wear starts, it accelerates quickly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Can This Repair Be Prevented?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can reduce the risk\u2014but not eliminate it entirely.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Best practices include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oil changes every 7 500km, not 15 000km<\/li>\n\n\n\n<li>Using high-quality oil<\/li>\n\n\n\n<li>Investigating check engine lights immediately<\/li>\n\n\n\n<li>Listening for cold start rattles<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Early detection may allow repairs before secondary engine damage occurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Is an Alloytec Commodore Still Worth Buying?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes\u2014but only with eyes wide open.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Commodore that has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Documented timing chain replacement, or<\/li>\n\n\n\n<li>Verified low timing deviation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">is far safer to own than one with an unknown history.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the timing chains haven\u2019t been addressed, the car should be priced accordingly, because this repair is almost inevitable over long-term ownership.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Final Thoughts<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Alloytec timing chain is the one Commodore repair that can truly write off the car. It\u2019s expensive, easy to ignore early, and catastrophic if left too long.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you own or are buying an Alloytec V6 Commodore, timing chains aren\u2019t just another maintenance item\u2014they\u2019re the difference between affordable ownership and an unexpected financial disaster.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In 2026, this single repair remains the biggest economic risk in Commodore ownership\u2014and the one every buyer should understand before signing the paperwork.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For many Australians, the Holden Commodore represents affordable power, space, and familiarity. But there\u2019s one repair\u2014particularly in Alloytec V6\u2013powered Commodores\u2014that has quietly written off more cars than blown head gaskets or failed transmissions ever have: timing chain replacement. VZ Commodore Specifications Why the Alloytec Timing Chain Is Such a Big Deal The Alloytec V6 engine [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3457,"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-2308","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\/ 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