Should I go full synthetic or part or regular oil with a 4.0L 103k miles?
Like the title says, I just bought an XJ with 103k miles (4.0L 93 Cherokee sport 5spd). I have always used synthetic on my Toyota's and Honda's with high miles, but I'm new to the Jeep's 4.0L engine. Will there be a prob with running Castrol Syntec blend with this many miles on the motor? What are everyones opinion on oil types for this Jeep? My concern is running a cleaner oil (synthetic) which could clean out the oil passages and in result cause the jeep to have some small oil leaks around gaskets and rubber and such. What do you all think?