Fuel additives

Are there any fuel or oil additives that are really good to use in 4-strokes? Such as marvel mystery oil...

What are you trying to accomplish with said additive? Longer fuel life, valve cleaning, etc?

Good oil needs nothing added. Good fuel has all the cleaning adds you'd normally need, and octane boosters are mostly a joke. (There are one or two "real" ones, but most people don't have a need for more octane)

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