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MMO might be "snake oil", but I'm a believer.
I had an old Audi with CIS and it behaved much better with a little MMO in the fuel. I add ~4oz per half tank fill-up to my '75 with 2.7 and CIS and it does seem to run better when it's there vs when it's not.
My dad and my uncle each had Mopar big blocks when I was a kid; they had some arrangement that fed metered MMO directly into the fuel from a separate reservoir. You could tell when the reservoirs were empty because both seeming to have a little "ting" at idle without the MMO.
And as Matt mentions - it's great for freeing up stuff that's sat around for a while.
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