I use black stuff..lol
I always thought that the 4.0L were pretty much bullet proof so I run Castrol Magnatec 10w 30...works great.
I agree there bulletproof, my family has a 90 Cherokee with the 4.0 and that thing raised me lol.. I have always just thrown in it whatever I can get that’s decent.. it’s always Dino too.. but this wrangler I bought has half the miles that does and I wanted to make sure I used the right stuff.. I was getting a few different answers from each place I looked figured I would ask here.. plus even tho there bulletproof does not give excuse to knowingly abusing them [emoji13].. I mostly use synthetic now for convenience.. less changes haha
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