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Snake oil. All of those additives are, in the truest sense, snake oil. Developed to mask symptoms, not fix them, they prey on the uninformed. You may think "no harm", but in fact I've seen MUCH harm from these types of additives over the years.
Just one example: I have a friend whose Mercedes ML430 landed in my garage for an engine rebuild, shortly after he put an oil additive in the crankcase. The condition of the internals was very telling. The additive did NOT mix well with the engine oil, creating a sort of "goop" in the sump. It also had very different lubricating properties, leaving the motor unprotected in places / at times.
I've had several other motors, transmissions and differentials over the years suffer the ill effects of additives. I won't use them any longer. (With the exception of some specific fuel additives)
Disaster.
Of course YMMV.
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