Not Ranked
Just for the record - Mobil1 does not come in 20W-50! It's available in 0W-30, 5W-30, 10W-30, 0W-40 and 15w-50. Ford recommended 5W-30 for my crate 351W, while Porsche recommends 15W-50 for my 944.
Neither recommends the various "snake oils" which seem to be popular with the Cobra guys.
Bob
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