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Shamus McFeeley
And how do you think the oil gets dirty to begin with?
The top end makes the crud (blowby past the rings) the bottom end has to live with until the oil is filtered/replaced.
Cleaning the top end breaks down the carbon putting it in the oil!
If anything, it's probably putting more out the exhaust than into my oil. Unless I have a ring sealing problem that is, then you're absolutely correct. I do appreciate your two cents, I misread your reply the first time thinking that you meant put B12 in the oil (instead of in the tank).
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