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My manual also has both weights. Because I live in Florida where we rarely have temps below freezing, I run 20W50. If I lived in a colder climate, I would probably run 10W40 in the winter. But 10W would be too thin for the temperatures here. You should be fine with 15W50 year round in CA, depending, of course, on where you are in CA.
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Carl S
Old Soldier
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