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I want to let you know that, so far, I am very pleased with Wal Mart's Super-Tech 10-30 synthetic oil and their Champion Labs oil filter in my 1993 Mercury Cougar 5.0 V8 with 38,000 miles. The engine seems to run smoother and this is backed up by close to a 5% increase in fuel mileage.(I have a...

I just purchased a 1981 yamaha 550 maxim with 25,000 miles. Any oil recomendations?