I also have a good experience with MMO fixing sticky valve tappets in 2 high mile vehicles. They are a pain when they make noise.
One way to approach this is to pour a quart in with say 700 miles left on a oil change. Left the stuff do its thing and dissolve a bunch of deposits.
Change the oil and filter and put another quart in the crankcase and run it through its next oil change cycle.
Then just change the oil and filter with no MMO.
See what happens.
It may work and it is way easier and cheaper than doing any mechanical work on a engine you just need to use and are not willing to put any money into like my 1995 Pathfinder with 370,000 miles.
Nick Kennedy
One way to approach this is to pour a quart in with say 700 miles left on a oil change. Left the stuff do its thing and dissolve a bunch of deposits.
Change the oil and filter and put another quart in the crankcase and run it through its next oil change cycle.
Then just change the oil and filter with no MMO.
See what happens.
It may work and it is way easier and cheaper than doing any mechanical work on a engine you just need to use and are not willing to put any money into like my 1995 Pathfinder with 370,000 miles.
Nick Kennedy