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20-50 is probably too much, unless youre living somewhere very hot and very dusty. even the 10w-40 or 15w-40 that i use is more than what my manual suggests i use. plus you cant compare a dragster with a road car. an engine thats replaced every 2nd race doesnt have too much useful info about longevity does it, although i happen to agree conventional oil is fine. after all thats what mazda knew everyone would be putting in their cars 15- 20 years ago
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