05/19/2026
Is your Chrysler, Dodge, Jeep, or Ram marking its territory in the driveway?
If you have a 3.6L Pentastar engine and oil is leaking from the back of the engine, don’t panic and assume it’s the rear main seal just yet.
We’ve had a lot of calls where customers were told, or assumed, it was the rear main seal. On these engines, 9 times out of 10, the real troublemaker is the factory plastic oil cooler / oil filter housing assembly.
Yes, plastic. Sitting in the valley of a hot engine. Holding oil. What could possibly go wrong?
When that housing cracks, warps, or the seals fail, oil runs down the back of the engine and makes it look like a rear main seal leak. Add in a few oil changes where someone tightened the filter cap like they were securing a wheel to a semi, and that plastic housing does not stand a chance.
At Zer0 Tech Mobile Repair LLC, we have the better fix.
We upgrade the failure-prone plastic oil cooler assembly to a full aluminum unit. It is stronger, more durable, and much less likely to crack the next time someone gets a little too confident with the oil filter cap.
The 3.6L Pentastar has been used in Chrysler, Dodge, Jeep, and Ram vehicles since the 2011 model year, with the Pentastar engine family still listed in production today.
Wikipedia
Before you approve an expensive rear main seal repair, have the leak properly diagnosed first. It might not be the rear main seal at all. It may just be that little plastic oil cooler assembly choosing violence.
Call or message Zer0 Tech Mobile Repair LLC to schedule a diagnostic or request an estimate.
📞 (281) 761-9192
📧 [email protected]
🌐 www.zer0techrepair.com
Diagnose first. Fix right. Stand behind it.