{"product_id":"4jj1-billet-oil-cooler-upgrade-fuse-tech","title":"4JJ1 Billet Oil Cooler Upgrade - Fuse Tech","description":"\u003c!-- ==================== Product: 4JJ1 Billet Oil Cooler Upgrade | FuseTech ==================== --\u003e\n\u003cstyle\u003e\n.product-description details summary{cursor:pointer;list-style:none;position:relative;padding-left:16px;font-weight:700;margin:10px 0;}\n.product-description details summary::before{content:\"▸\";position:absolute;left:0;color:#00c853;transition:transform .2s;}\n.product-description details[open] summary::before{transform:rotate(90deg);}\n\u003c\/style\u003e\n\u003cdiv class=\"product-description\"\u003e\n\u003ch1 style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cu\u003e🧊 4JJ1 Billet Oil Cooler Upgrade – CNC Billet Aluminium\u003c\/u\u003e\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2 style=\"text-align: center; margin: 0 0 10px;\"\u003eOne Cooler. Every 4JJ1. 2005–2020 | FuseTech\u003c\/h2\u003e\n\u003c!-- ===== TRUST BADGES ===== --\u003e\n\u003cdiv class=\"crc-badges\"\u003e\n\u003cspan class=\"badge-fusetech\"\u003e⚡ FuseTech Performance\u003c\/span\u003e \u003cspan class=\"badge-red\" style=\"background:#00c853;color:#0d0d0d;\"\u003e✅ Suits ALL 4JJ1 2005–2020 🔥\u003c\/span\u003e \u003cspan class=\"badge-blue\"\u003e💳 Afterpay • Humm • Klarna • Zip\u003c\/span\u003e \u003cspan class=\"badge-black\"\u003e🚚 Free Express Shipping AU\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eThe oil cooler your 4JJ1 should have come with.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eFuseTech billet aluminium oil cooler\u003c\/strong\u003e replaces the factory unit on every 4JJ1 from 2005 through 2020 — early alloy rocker cover engines and later DPF models alike. Factory coolers are a known weak point on high-kilometre and worked engines: internal leaks put oil into coolant (or coolant into oil), and once a bearing has spun, the old cooler is full of metal debris that can't be reliably flushed. This CNC-machined billet upgrade fixes both problems in one hit.\u003c\/p\u003e\n\u003cp style=\"background: #ffebee; padding: 12px; border-radius: 4px; margin: 16px 0; border-left: 4px solid #c62828;\"\u003e\u003cstrong style=\"color: #c62828;\"\u003e⚠️ SPUN A BEARING?\u003c\/strong\u003e Replacing the oil cooler is non-negotiable on any bottom-end rebuild. Debris trapped in the old cooler will take out fresh bearings. Fit new — don't flush and hope.\u003c\/p\u003e\n\u003chr\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;\"\u003e\n\u003ctr\u003e\u003cth colspan=\"2\" style=\"background:#00c853;color:#0d0d0d;text-align:left;padding:10px;font-weight:700;\"\u003eSpec Snapshot\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;width:38%;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003eCNC-machined billet aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003e\u003cstrong\u003eEngine fitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003eAll 4JJ1 (2005–2020) • also suits 4JK1 2.5L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003e\u003cstrong\u003eFitment type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003eDirect replacement for the factory oil cooler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003e\u003cstrong\u003eUse case\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;border-bottom:1px solid #1f1f1f;\"\u003eLeaking factory cooler, engine rebuilds, preventative upgrade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#0d0d0d;color:#f5f5f5;padding:10px;\"\u003eFuseTech Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003cdetails open=\"\"\u003e \u003csummary\u003e✅ Key Features\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e🧊 \u003cstrong\u003eBillet Construction:\u003c\/strong\u003e CNC-machined aluminium — eliminates the cracking and internal leak failures of the factory cooler\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eImproved Heat Dissipation:\u003c\/strong\u003e Keeps oil temps in check on towing, touring and tuned builds\u003c\/li\u003e\n\u003cli\u003e🔧 \u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Fits in place of the factory oil cooler\u003c\/li\u003e\n\u003cli\u003e🧰 \u003cstrong\u003eRebuild Essential:\u003c\/strong\u003e The correct fix after a spun bearing — no debris carry-over into a fresh engine\u003c\/li\u003e\n\u003cli\u003e🚗 \u003cstrong\u003eOne Part, Every 4JJ1:\u003c\/strong\u003e Covers 2005–2020, alloy and plastic rocker cover engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails open=\"\"\u003e \u003csummary\u003e🔧 Vehicle Compatibility\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eIsuzu D-MAX – 4JJ1 (2006–2020, all variants incl. DPF)\u003c\/li\u003e\n\u003cli\u003eIsuzu MU-X – 4JJ1 (2013–2021)\u003c\/li\u003e\n\u003cli\u003eHolden Colorado RC – 4JJ1 (2008–2012)\u003c\/li\u003e\n\u003cli\u003eHolden RA7 Rodeo – 4JJ1 (2007–2008)\u003c\/li\u003e\n\u003cli\u003eAlso suits 4JK1 2.5L variants\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Does not suit the 4JJ3 (2020+ D-MAX\/BT-50). Message us with your VIN if unsure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e \u003csummary\u003e📦 What's Included\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e1 × FuseTech CNC billet aluminium oil cooler\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: .95em; color: #555; margin-top: 8px;\"\u003e\u003cem\u003eFresh gaskets and seals are recommended at installation — contact us if you need them supplied with your order.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e \u003csummary\u003e🛠️ Installation \u0026amp; Requirements\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eDirect replacement for the factory oil cooler\u003c\/li\u003e\n\u003cli\u003eProfessional installation recommended — correct sealing and cooling system bleed are critical\u003c\/li\u003e\n\u003cli\u003eReplace gaskets\/seals during installation; never reuse old seals on an oil-to-coolant interface\u003c\/li\u003e\n\u003cli\u003eOn rebuilds, flush the oil galleries and cooling system before fitting the new cooler\u003c\/li\u003e\n\u003cli\u003eContact us to confirm stock availability if timing is critical\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e \u003csummary\u003e🛡️ Warranty \u0026amp; Returns\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cp\u003eCovered under our standard policy — see our \u003ca href=\"https:\/\/www.commonrailcowboys.com\/policies\/refund-policy\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eRefund, Returns \u0026amp; Warranty Policy\u003c\/a\u003e for full terms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e \u003csummary\u003e💳 Payment \u0026amp; Shipping Options\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e💸 \u003cstrong\u003eBuy Now, Pay Later:\u003c\/strong\u003e Afterpay, Humm, Klarna \u0026amp; Zip available\u003c\/li\u003e\n\u003cli\u003e✈️ \u003cstrong\u003eFree Express Shipping Australia-Wide\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e📦 Diesel performance specialists — not general parts resellers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e \u003csummary\u003e❓ Frequently Asked Questions\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my year 4JJ1?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes — this cooler suits every 4JJ1 from 2005 to 2020, including early alloy rocker cover engines and the later 2017–2020 DPF models. It also suits the 4JK1 2.5L. It does not suit the 4JJ3.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why do I need a new oil cooler after spinning a bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Bearing material ends up trapped inside the factory cooler's internal passages and can't be reliably flushed out. Reusing the old cooler on a fresh engine risks sending that debris straight through your new bearings. A new cooler is standard practice on any proper rebuild.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my factory oil cooler is leaking?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The classic signs are oil in the coolant (milky residue in the overflow bottle or radiator) or coolant in the oil. If you're seeing either, pressure-test the cooler before condemning head gaskets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this a direct bolt-in replacement?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes — it replaces the factory oil cooler directly. Use fresh gaskets and seals, and bleed the cooling system properly after installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the FuseTech billet oil cooler fit my year 4JJ1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. It suits every 4JJ1 from 2005 to 2020, including early alloy rocker cover engines and the later 2017-2020 DPF models, plus the 4JK1 2.5L. It does not suit the 4JJ3.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does the oil cooler need replacing after a spun bearing on a 4JJ1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bearing debris becomes trapped in the cooler's internal passages and cannot be reliably flushed out. Reusing the old cooler risks destroying the fresh bearings in a rebuilt engine, so a new cooler is standard practice on any proper rebuild.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I know if my 4JJ1 factory oil cooler is leaking?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Common signs are oil in the coolant, such as milky residue in the overflow bottle or radiator, or coolant contamination in the engine oil. Pressure-test the cooler before condemning head gaskets.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the billet oil cooler a direct bolt-in replacement?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, it replaces the factory oil cooler directly. Fresh gaskets and seals should be fitted and the cooling system bled properly after installation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c!-- GREEN BANNER CTA - FuseTech Theme --\u003e\n\u003cdiv style=\"background: linear-gradient(135deg, #00c853 0%, #00c853 100%); color: #ffffff; padding: 20px; text-align: center; margin: 20px 0; border-radius: 6px; box-shadow: 0 0 25px rgba(0, 200, 83, 0.6), 0 0 40px rgba(0, 200, 83, 0.4), 0 0 60px rgba(0, 200, 83, 0.2);\"\u003e\n\u003ch2 style=\"margin: 0 0 10px; font-size: 20px; color: #fff; text-shadow: 0 0 10px rgba(0,0,0,0.3);\"\u003e\u003cstrong\u003e⚡ PROTECT YOUR 4JJ1'S BOTTOM END\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp style=\"margin: 0; font-size: 15px; color: #fff; text-shadow: 0 0 5px rgba(0,0,0,0.3);\"\u003e\u003cem\u003eFuseTech CNC billet oil cooler. All 4JJ1 2005–2020. The right fix for leaking coolers and rebuilds.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 12px; opacity: .8; margin-top: 16px;\"\u003e\u003cstrong\u003eDisclaimer:\u003c\/strong\u003e Common Rail Cowboys is not affiliated with Isuzu Motors or Holden. Installation should be performed by a qualified technician. Fitment verification and correct installation are the buyer's responsibility.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"FuseTech","offers":[{"title":"Default Title","offer_id":46935614685238,"sku":"4JJ1-BILLET-OIL-COOLER","price":731.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/7868\/6518\/files\/rn-image_picker_lib_temp_16471c65-2f14-42bf-93a3-445298892b7d.jpg?v=1784551801","url":"https:\/\/www.commonrailcowboys.com\/en-nz\/products\/4jj1-billet-oil-cooler-upgrade-fuse-tech","provider":"Common Rail Cowboys","version":"1.0","type":"link"}