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First off, I drive a WRX and I want to stay within warranty compliance and so I am sticking with the OCI of about 3750 per the manual(until 60k miles). My earlier post had some very good answers, but a lot of the recommendations were synthetics. I know some synthetic blends will be better for my...

1. What kind of vehicle you have I have a brand new 2010 Subaru WRX w/only 2000 miles on the odometer. The only mods that it has is an SPT cat-back exhaust. Everything else, turbo, engine, etc. is stock and will stay this way for awhile. 2. What your owner's manual says -- not just viscosity...