I'd saty with the MFG recommended oil weight for your engine.
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The better cold pumping of a synthetic 0W-30 oil will work fine in any
engine specified for 5W-30 or 10W-30. The first number refers to the
cold characteristics of the oil and the second to it's viscosity when at
Many people make the mistake of thinking that a 0W-30 is "thinner" than
a 10W-30 because it is indeed so at room temperatures, but when hot they
are the same grade.
Fuel economy improvements would be limited to the short time the oil is
getting heated up, so if your commute is a short sub 15 minute one after
a stone cold start it might make a difference.
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