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Oil/Gas Additives

Been watching a lot of YouTube on different ones. I used to scoff at it all, but some of this stuff is pretty credible. Marvel Mystery oil has nothing but good reviews. Seafoam, Liqui Molly, etc. Mostly useful on older higher mileage engines. Most of the gas additives are not very impressive as a carbon remover, but the oil additives are, which in turn improves compression, mileage, and reduces internal engine noise.

Do you use them?
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