How's this off the top of my head real fast.
MMO freed up an gas float in an old Ford I bought many years ago. The owner told me when I bought the car the gas gauge didn't work, and hadn't worked for years. A few tanks of gas with MMO freed it up and it worked until I sold the car.
Stopped lifter noises for friends more times than I can count at the moment. Freed up a stuck ring in a 250I I-6 Chevy boat engine as confirmed by compression testing. Cleared up varnish and sludge that I was able to see. Sorry no digital cameras in those days. As far as cost my mechanic is charging $100/hr, so you'd have to calculate time and materials to replace lifters, in the above example or taking an engine apart to replace a stuck ring, or remove sludge and varnish. I think at less than $4 a qt MMO is a deal!
MoS2, eliminated start up smoke in a Briggs Powered mower, now closing out the second lawn cutting season with it. It also reduced oil use in my 93 Aerostar.
MMO keeps engines clean, especially new ones by preventing garbage formation. Dosing, depends on how the car is driven and how many miles a year are logged. I'd think a pint added for the last 1000 miles of an OCI would probably do the trick once a year for the average driver.
YOU DON'T BELIEVE ME, DON'T USE IT, it really doesn't matter, but if you haven't tried it don't knock it either. Here's another thought prove to me it didn't work as I've stated so many times before! Good luck! I've been using MMO since the 1970's.
For more info check with these guys: c3po and Sypder7, there are dozens more but you'll have to do some searching, sorry.