Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug, Pack of 4

I have an F350 DRW with a 6.0 diesel that I pull a 45 foot 5th wheel toy hauler with. Oil changes are the LIFE of this motor. I just returned to FL from a trip to Sturgis, SD an then ran from Hurricane Irma and this oil is working awesome. I monitor every aspect of the motor while it is working and this oil is "just what the doctor ordered" to keep my 6.0 working, and playing!!

I purchased Lucas fully synthetic oil for its price to try in my 375 h.p. John deere. This engine is in my lobster/scallop vessel where the engine gets run very hard for extended periods. Lucas oil has given the engine better oil pressure and as far as performance I will have to wait until my next oil change. But it will be with Lucas 15w40 Lucas fully synthetic oil. Thank you Lucas oil for a great product at a reasonable price.

It's been two weeks since I switched to Lucas oil and my truck loves it. She purrs like a Big Kitty. She's a lot quieter and runs much smoother. I can proudly say she's a happy camper.

Its a little pricey. I'd normally buy the cheaper oils but I really like the lucas brand oils think it preforms well in my cummins or heavy equipment.

Duramax truck

Excellent, the engine seems to run smoother, I’m happy.

I love all things Lucas. However, my 2005 Dramax is now using oil after switching to the lucas 15w40. No external leaks. My oil pressure gauge reads lower at idle than it ever has. Master mechanic friend suggested tha seals in the turbo may be pressure dependent and are allowing oil to seep in. Going to add some Hapco seal restorer and monitor closely. May have to go back to Rotella.

Best value I have seen.