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Should not have to put any additive in a factory engine is there a fix for the pinging valves
I've got an 09 FXDC, though I'm not having any knocking/pinging problems, there will be times when I have no choice but to put regular gas in the tank. What is your recommendation on the brand of octane booster to buy? I know there are several to choose from, but I don't know which ones really boost the octane rating.