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  1. WillWagner

    15w 40 Rotella Vs 30 weight oil

    An "S" rating is a spark ignited SAE rating. Look for the "C" rating. That's for a compression fired engine. CF and SM are the latest ratings, with low ash and all the special junk for the up and comming DOC and DPF engines.
  2. WillWagner

    15w 40 Rotella Vs 30 weight oil

    Valvoline Premium Blue 15W40 here.
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