I have been using Joe Gibbs DT40, and I get by the quart at Amazon so I only have to buy 9 or 10 quarts at a time vs a case of 12. Free shipping and the cost per quart isn't that much more than single quarts of Mobile 1 or the others at a local store. For my other vehicles I run Castrol Edge Synthetic 5w30 that I get in the 5 quart jugs at WM but single quarts at WM seem to be around the same price as everywhere else. Amazon carries the Motul as well.
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