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Old 08-06-2010, 11:37 AM   #10
37 Coupe
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Join Date: May 2010
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Default Re: Marvelous Mystery Oil?

I never used MMO or had a stuck valve in a flathead especially a rebuilt one until two years ago, the ethanol in the fuel must be the reason it is becoming more common now. Probably only had a couple hundred miles on 59AB engine and it ran fine in the morning going to local car show.After sitting all day with the hood up in about 90 degree weather it started and ran terrible driving home,missing and backfiring like the timing somehow was off. Remembered reading about this on the old Ford Barn and next morning tried the MMO down both sides of the carb with engine idling,took it down road and it cleared up and ran smooth after about a 1/2 mile. I put the prescribed 4 oz in 10 gallons every fillup now,I am a believer. Also I have heard that 10% ethanol is enough alcohol to contribute to tank or fuel line rust and in my mind the oil may help against this.
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