Don't know about the rest of you guys but I am a believer in MMO. This product is talked about on all the forums in the USA related to old engines. Marvel Mystery Oil is an additive that seems to work like magic on old engines. I have no idea what's in it but from my experience all my engines work better with it. MMO can be added to the crankcase oil or it can be added to the fuel as an additive. I suspect that in the oil it has some detergent qualities which will free up everything it touches. In the fuel system it also seems to clean things up, even gunky under performing carbs and fuel systems seem to benefit. Available at Walmart.
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