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Having gotten 200,000 miles or better on each of my last three cars (two Subarus and a '68 Mustang) running plain, old Havoline 10W40, I'm of the opinion that frequent oil and filter changes have much more to do with engine longevity than the brand (or astounding claims) on the label. IMHO, paying four prices for a quart of oil doesn't make a great deal of sense.
dcb
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