[PUFF00]

Good article on oil. I don't know the person who wrote it, but he seems to give an objective opinion.
http://www.uti.com/~hoser/4strokeoil.htm

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2001.5 3500 QC 4X4 6-speed HO 3.55 black
1998 Jeep TJ black http://www.nm4w.org/members/puffer.htm