I am going to switch to Mobil Delvac 1 from another synthetic oil in my 8V92TA. I have been able to find 5W40 Delvac 1, but the straight weight Delvac, what viscosity is it available in? And/or if I use the multi viscosity, what should I use? I am about to contact a dealer and buy a 30 or 55 Gal drum.
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