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    Rotella T6 15w40 not 5w40

    Hello All, I am new to the Forum. I own a 2018 Chevy Silverado LTZ 2500 L5P Duramax. I just finished an oil change with the new T6 15w40. I tow a 10000 pound bumper pull trailer with it. Once I hit 5000 Miles on this change I will do a used oil analysis on this oil and see what the numbers look...
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