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651 6/28/2002 8:39:12 AM 6/28/2002 Tech Talk Staff TechTalk@newellcoach.com 1980 Newell Coach It is correct that, as a general rule, multi-grade oils should not be used in Detroit Diesel Series 92 engines. However, Delvac 1 synthetic is an exception. We have used multi-grade Delvac 1 backed up by oil analysis for twelve years. It is an excellent oil for a 92 Series engine. However, the anti-multi-grade culture at Detroit is strong, and the "Newell/Mobil" exception to the general rule is not well known in the trenches. Detroit now offers a straight weight version of synthetic engine lube, a choice that many of the old-time service people are more comfortable with.
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