From: mwbg9715@uxa.cso.uiuc.edu (Mark Wayne Blunier)
Subject: Re: 5W30, 10W40, or 20W50
Organization: University of Illinois at Urbana
Lines: 12

zowie@daedalus.stanford.edu (Craig "Powderkeg" DeForest) writes:

>If you're planning on making long drives, the 20W50 is probably fine
>(esp. in the summer) in your 10W40 car.  But if you're making short drives,
>stick to the 10W40.

Several years ago GM was having trouble with the rings sticking on the
5.7 diesel.  They traced a cause to the use of 10W-40 oil.  They would
not honor warranty work if 10W-40 was used (if my memory serves me).
5-30, 10-30 or 20 50 was OK'd though.

Mark B.
