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I owned an '90 YJ new with a 258 w/ a Weber Carb. I drove it for sixteen years and did the PM myself. It was my daily driver & trail mule. When I sold it in '06 to buy this LJ it had 225,527 on the ticker, I used nothing but Castrol GTX 10W-30, and it's still running around town today 'cause I...

Originally Posted By: MetalSlug one last thing, dint they reduce the need of zddp on newest 4.0l I6 engine ? Don't know, Thought they were all the same, anyone else know if that's true?

Thanks Guys, I was just wondering about the zinc levels that's all. See around the forum! Army_Guy " Jeep Wave " back at ya! Thanks for serving!

What oil should I use that has the proper zinc content for the 4.0L? It has 111,965 on the ticker, I've used Casteral GTX 10W-30 from '06 to '10 then switched to Rotella T 10W-30 for the past year. With all the talk of premature wear within the 4.0L, I'd like to know what oil should I be using...