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Regalman, you might find useful info at this site: http://oilstudy.spacebears.com An 18,000 mile test of Mobile 1, having analyses and changing the filter at periodic intervals proved the longevity of this oil. Jonathan

I joined today and look forward to reading interesting comments, theories, facts. May I offer a website apropos the topic of oil change intervals, filter changes, synthetic oils? This site describes an ongoing test of Mobile 1. The results after almost a year and 18,000 miles is very...