Originally Posted by littleant
Originally Posted by jeepman3071
Originally Posted by Donald
Next will be a piston skirt cracking on these engines.
It happens, but rarely.
Agree. My 02 jeep with the 4.0 has had piston slap that goes away when warm for 125,000 miles. It now has 163,000 miles. I always let it warm up before driving. Using same oil as the OP. Winter vehicle. And we have BRUTAL winters.
I have a 2.5 in a Dakota with 269K, and it always has piston slap, even when warmed up. Runs perfectly smooth, and doesn't burn or leak a drop on 15w-40. Gets 26 MPG on the highway. Piston slap 4 life.