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I've been driving a Ram 2500 with the 5.9 Cummins Turbo for about 5 years. No complaints at all.
No experience with Bio per se, but worked around two of the chemicals used to prepare it (Potassium Hydroxide and Methanol) for several years. I have heard rumors of concerns with gasket deterioration when older engines are switched over, but other than that, Bio sounds like a definite thing to look into.
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