Originally Posted by ROFLwaffles
My 97 zj 4.0 has 198k miles on it. And has developed a bit of a tick. I have been told that this is actually quite normal for these I6 engines.
I live in Washington state, and our temps never really vary that much during winter or summer (not too hot, not too cold). I have been running a standard 5w-30 oil. But I am wondering, would it be better to run a 40w? Maybe a 10w-40? And are there significant advantages to a "high mileage" oil?
And if I do change the type, is there any particular additive I might want to try?
This stuff is all new to me. This is my first Jeep, and I welcome any advice you all may have.
Give 10w-40 a try. Older engines tend to benefit from a little higher-weight oil.
If your wallet can manage it, try Rotella T6 5w-40. It stopped my ticking completely, very good oil. WalMart has the best prices on it.