Well, after 9 years I finally discovered the noise that caused the warranty pull on my 4.0L. It occurs cold, not hot! Just like forged pistons, not quite as bad though. I don't mind at all, it only lasts for about 3-5 minutes. Kind of old school noise! Might be the Shell Rotella 15-40 too. IIRC I was running 20-50W Castrol before. -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 " I was different before people dared to be different" -------------- Original message ---------------------- From: Tom Jennings <tomj@xxxxxxx> > If I could only recall why it was that we all like modern-design > engines.... ? > > > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://www.amc-list.com/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list