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    Rotella T6 or M1 10w-40 to reduce Consumption

    I am currently using M1 0w40. Have had no problems other than the 1 quart that vanishes every 4000 miles. I think it is this reason my Car is throwing a code for Catalytic efficiency below threshold on BOTH banks so.. Im wanting to reduce the oil consumption but stay in the 40 weight because...
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