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  1. lumberjack

    Best oil additive ever!!

    Yeah, I've thought of it, but that's about it so far...
  2. lumberjack

    Best oil additive ever!!

    Guess I should try it on both of my 6.0s. The 550 has 212k miles, the 250 has 112k. The 550 doesn't like cold weather starting usually, both run Rotella T6.
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