I read up on this same topic a lot on the diesel forums. seems that the popular oil is delo 5w40 syn. I put it in mine with rev x and its been great.. i switched from schaffers which was terrible on cold starts.. before that was rotella 15w40. switching from the rotella to the schaffers I noticed a difference immediately. stay away from the schaffers. the big topic of discussion on the diesel forums what phosphorus in the oil.. some connection between phosphorus content and resistance to inje for spool valve sticktion.
Update: had some injector stiction issues a while back(right when diesel power did the archoil feature) bought it and ran it as and almost instantly fixed the issue just as they described in the article.
Thanks John. Ar9100 is a new thing for me. Only on really cold mornings last winter I had the cold start issue... I will be putting it in.
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