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Originally Posted by 2K3_Boxster_S
my thoughts as well. Why is everyone recommending 10w this and 10w that when Boxsters come from the factory with 5w-40?
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My 2000 Boxster S owner's manual lists 10w40 synthetic among the acceptable oil choices. Porsche has migrated to 0w40 and 5w40 more recently in order to (supposedly) improve fuel economy. The whole auto industry is moving to 5w and 0w oils for that reason. That doesn't mean that I have to do so, though.