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Thread: Gas mileage and oil change -Is there relationship?

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  1. 11-20-2004, 03:17 PM #11
    TC535i Guest

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    One more question...

    What affects the normal running viscosity more, the first or second number? What I mean is, I'm running a 15-40 now... will I get better gas mileage if I lower the first number, or the second? My guess is the second, but... somebody out there must know better than I.
    Last edited by TC535i; 11-20-2004 at 03:20 PM.
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