I put a few oz of MMO in the gas of my Ford 640 tractor.The gas shut off valve bound up so bad that it took a large screwdriver to open and close it.This went on for about a year before I could open it by hand.I open it just 2 turns.After a while the valve started leaking, the o ring is shot.Anytime I post this the MMO users go nuts and attack.If I had kept the MMO out of the gas I wouldnt have to put a new o ring in the valve.New valves cost 60 bucks.I put Shell Rotella in my truck last year and saw some erratic oil pressure for a while.I dont think I will use it again.I worked for a JD dealer and was working for a Ford auto dealer when the 57 Ford was a brand new car.
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