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  1. pmramsey

    Motor Oil - Synthetic or Rotella?

    non-turbo gets the regular 15-40 Rotella Turbo gets the semi-synthetic 15-40 Rotella My 1965 M54A1 with the turbo gets the semi-synthetic 15-40 Rotella. However, zinc additive for the flat-tappet portions of the engine is essential.
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