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#12: 02-27-2013, 03:52 PM
Title: Junior Member
Location: Dixie
Car: 2011 Subaru/2002 Audi TT Quattro
Posts: 71
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Rather than shorten the service interval, it would make more sense for Subaru to allow the use of thicker synthetic oils for hot climates, and/or for sustained high speed driving. If you went from a 0w-20 to a 5w-30 synthetic, I'd only expect maybe a 1.5% reduction in mpg, ie almost down in the noise level. With a thicker, even less volatile 10w-30 synthetic, you might take a 2% hit.