My dad has 2, a '89 and a '95, both 4x4. On the '89 it has a sealed cooling system, they have had some minor problems with, '95 hasn't had any though. One thing about the 4.0 cherokee is if the left motor mount goes out the exhaust manifold breaks, we replaced the mount and welded it back....pretty easy fix.( or you can buy the aftermarket manifold with the flex pipe in it for like $300) Other than that he loves them.