I mostly agree with Randall. I've used RedLine last two fillups (usually 19 gallons of deezl). Haven't noticed any change in perfomance. She doesn't smoke or shake though. I only add it as good measure to get rid of any potential water in the tank. One bottle of RedLine is supposed to dry up a couple of ounces of water. Maybe your situation is that some sediment at the bottom of the tank was broken free?

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Barker