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I would be fine using it on a B48/B58TU or later engine and not use it on any car before that. Those cars have the 48V system and IROX coated rod bearings. I don't use it on my M2C as I think it is probably a contributor to rod bearing wear on N55 and S55 engines. I would also not use it on S58 as it shares rods and bearings that have the older material with S63.
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