re: OT mechanics - Best engine cleaning additive (oil)

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I see all kinds of additives, but what is the best?

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Most decent mechanics will tell you not to do engine flushes. Most of them are snake oil and you are just paying for some kerosene and a few solvent additives. MMO and Seafoam have limited solvent capacity in the amounts you can safely run in the engine, they aren't going to do much when there's a lot of hard deposits and varnish involved. The best way to go, assuming you don't have an engine that has stuck rings, is to simply start using a quality synthetic oil/filter and change the oil on shorter intervals. Most oils have increased detergent additives now, synthetic oils especially and they can clean out an engine gradually.