RateNate
Thread starter
Yeah I was looking at their 15w40 flavor but I noticed T6 had a 20c degree higher flashpoint….I've been pretty happy with Mobil Delvac 1 ESP, in 5W-40 flavor. It's more robust than the Mobil1 TDT 5W-40. Using it in almost everything, from 1.4L T-Jet Fiat to a 6.7L Cummins Ram. Plenty of high RPMs, and never any oil-related issues.
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