Synthetic oil's in the 8V92 With one significant exception, Newell recommends that operators of Detroit Diesel engines follow Detroit's recommendations regarding lubricating oils for their various engine models. This document can be downloaded with Adobe Acrobat software at
www.detroitdiesel.com/public/svc/lofindex.asp . The exception is that Newell has confirmed over long term oil sample testing that multi-grade Mobil Delvac 1 performs very well in Detroit's two-stroke engines (92 series). However, Mobil (and Detroit through a private labeled Mobil product) now offer a straight weight version of Mobil Delvac 1. At Newell, we still like the multi-grade Delvac 1 because of easier starting in cold weather, but be prepared to experience a lot of prejudice against use of a mulit-grade in a two-stroke Detroit.