FuseTech
4JJ1 Billet Oil Cooler Upgrade - Fuse Tech
4JJ1 Billet Oil Cooler Upgrade - Fuse Tech
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CNC Billet Aluminium | Direct Replacement | 4JJ1 2005 to 2020
The oil cooler your 4JJ1 should have come with.
Factory coolers are a known weak point on high-kilometre and worked engines. Internal leaks put oil into the coolant, or coolant into the oil. And once a bearing has spun, the old cooler is full of debris that cannot be reliably flushed.
The FuseTech CNC billet aluminium cooler replaces the factory unit on 4JJ1 engines from 2005 to 2020, early alloy rocker cover engines and later DPF models alike.
What Is Included
- 1 x FuseTech CNC billet aluminium oil cooler
Not included: gaskets and seals. Fresh ones are recommended at installation. Contact us if you need them supplied with your order.
Key Features
- Billet construction: CNC-machined aluminium, built to get away from the cracking and internal leak failures of the factory cooler
- Heat dissipation: designed to help keep oil temps in check on towing, touring and tuned builds
- Direct replacement: fits in place of the factory oil cooler
- Rebuild essential: the correct fix after a spun bearing, with no debris carried over into a fresh engine
- Use case: leaking factory cooler, engine rebuilds, preventative upgrade
Spun a bearing? 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. Do not flush and hope.
Vehicle Fitment
- Isuzu D-Max: 4JJ1 (2006 to 2020, all variants including DPF)
- Isuzu MU-X: 4JJ1 (2013 to 2021)
- Holden Colorado RC: 4JJ1 (2008 to 2012)
- Holden Rodeo RA7: 4JJ1 (2007 to 2008)
- Also suits 4JK1 2.5L variants
Does not suit the 4JJ3 (2020 on D-Max / BT-50). Message us with your VIN if unsure.
Fitting Notes
- Direct replacement for the factory oil cooler
- Professional installation recommended: correct sealing and cooling system bleed are critical
- Replace gaskets and seals during installation. Never reuse old seals on an oil-to-coolant interface
- On rebuilds, flush the oil galleries and cooling system before fitting the new cooler
- Contact us to confirm stock if timing is critical
Recommended Add-Ons
Shipping and Payment
- Free Express Shipping Australia-wide. Full tracking included.
- Buy now, pay later. Afterpay, Humm, Klarna and Zip at checkout.
- All major credit cards accepted.
- Warranty and returns: see our refund and warranty policy.
Frequently Asked Questions
Q: Will this fit my year 4JJ1?
A: It suits 4JJ1 engines from 2005 to 2020, including early alloy rocker cover engines and the later 2017 to 2020 DPF models. It also suits the 4JK1 2.5L. It does not suit the 4JJ3.
Q: Why do I need a new oil cooler after spinning a bearing?
A: Bearing material gets trapped inside the factory cooler's internal passages and cannot 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.
Q: How do I know if my factory oil cooler is leaking?
A: The classic signs are oil in the coolant (milky residue in the overflow bottle or radiator) or coolant in the oil. Pressure-test the cooler before condemning head gaskets.
Q: Is this a direct bolt-in replacement?
A: Yes. It replaces the factory oil cooler directly. Use fresh gaskets and seals, and bleed the cooling system properly after installation.
Protect Your 4JJ1's Bottom End.
FuseTech CNC billet oil cooler for the 4JJ1. The right fix for leaking coolers and rebuilds. Free express shipping Australia-wide.
Common Rail Cowboys is not affiliated with Isuzu Motors, Holden or FuseTech. FuseTech is a trademark of its respective owner. Installation should be carried out by a qualified technician. Confirming fitment for your vehicle is the buyer's responsibility. Modifications may affect vehicle warranty and compliance.
