I just learned that wax isn't supposed to form in oil - too cold. I can always find some under my oil fill cap, using 10W-40 all-mineral. Obviously, this isn't a performance problem, just a clue to the oil's engineering.
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Serious west Texas style tech right there.Crude oil contains paraffin, most of which is removed in the fractional distillation process to separate the crude oil into gasoline, jet fuel, diesel, lubricating oils, etc. If the wax bothers you, use a synthetic oil instead of a mineral-based oil.