What Oil Grades are Best for My DD 6V92?
I need to make sure that I understand your guidance here. I have a '78 with a Detroit 6V92TA. The engine was produce in 1980, and retrofitted to the coach. In all that I have read, especially from Detroit, the only oil to use under standard conditions is SAE 40 oil. Detroit does especially speak strongly against multi viscosity oils. If I understand you correctly, Delvac is the unique exception to this rule. With an engine of this model and age, should I switch to Delvac 1?
Last question...what about the other Delvac's, are they also appropriate, or is Delvac I the only Delvac to use in these engines?
Dick Quirk
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