Rotella Diesel Oil

[Madmanmarty]

I use t6 full synthetic in all my engines.
Our 4.0 engines love it.
Because it is full synthetic it is great for cold and hot climates.
I do oil changes every 5k also.

 

[87manche]

I run Rotella 15-40 in all the 4 XJ's we have in the family and also in my 94 V8 ZJ without issue. But I live in California were its always hot and the winters never get to cold, If you live in a climate where it gets really cold than the added thickness of Rotella may not treat your motor as well on cold start ups.

no issues turning a 4.0 filled with 15w40 over this last winter at -13, a pair of them actually.

just let it warm for a few minutes before you go driving.

in other words, don't be a moron.