PP or Dino in a 4.0L Jeep

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How far did you want to extend your OCI?

PP would be a good choice. So would Mobil 1.

If there is more wear with Mobil 1 it is very small. Most of the info on more wear is based on higher iron numbers on UOA's. UOA's do not tell the whole story. If you find people who have actually tore down a Mobil 1 engine the wear is fine and the engines are clean.
 
I have been using MaxLife 5w30 semi-syn at 5K intervals in our '96 GC 4.0 (10w30 in summer) and it is very quiet for a 4.0. At 143K it leaks a little in the usual spots but does not burn any. Wonderful engines...

Andrew S.
 
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