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    How long should I run M1 extended oil?

    M1 boasts 15k mi between OCIs. I have been using normal M1 in my Jeep TJ for the last 3 or 4 oil changes which have 3k mi apart. This time, I picked up a jug of M1 Extended Performance and an oversize RP filter (which also boasts 15k mi). Can I really get 15k mi out of these products, or is...
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