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amsoil is the shit

  1. Synthetic or not?????

    01-04.5 LB7 Duramax Powertrain
    I am the proud owner of my first D-Max and my buddy has an LBZ and he told me NOT to switch cause my LB7 has 101500 miles on it. Ive talked to other guys and they say don't worry about it it'll be fine looking for any input I don't want a bunch of leaks I can't find says my buddy. I was gonna go...
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