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    10 yr old V8 BMW: M1 0w40 or M1 10w40 Hi Mileage?

    Hi folks, I've got a BWM 540i/6speed. 135k. I've always run Mobil 1 0w40, but I'm considering trying out the M1 High-Mileage synthetic. http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_High_Mileage_10W-40.aspx Site says it's has a higher level of detergent plus seal conditioners...
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