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Well a lot of the subaru guys swear by Seafoam regardless of mileage but I know a lot of other people who think that it wrecked their cars too. My opinion is that it's not going to hurt anything if used properly if you have carbon deposits and other junk in your engine that are so bad that when they get cleaned out your engine leaks or breaks you would have had the same thing happen pretty soon anyway.
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Aiming for 50 MPG from an automatic.
See how I'm doing here, My Build Thread
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