I read alot about MMO,rislone concentrate, seafoam, berryman ect.
I just ran rislone concentrate, 16.9 oz. the website says too use in oil for entire OCI duration. I belive though, you replace 16.9 ozs of oilwith the rislone. They also say to clean up an engine, stuck rings, too use 2 16.9 ozs bottle, thats a quart of oil your going to replace with rislone. Drive 100 miles on it, then drain oil, change filter.
Right now i am running a quart of MMO with PYB 5w30,4 quart sump. Thier supposed to be slow cleaners.
In my reasearch, ive concluded..use mobil 1 oil. i had a 95 neon, and about 10 years ago, used it,did an oil change, 3 days later, i saw a puddle of FRESH oil under the car and looked. it was coming from rear main. The mobil 1 cleaned everything up for sure. or maybe the high mileage mobil one, though a few here seem too think or know, mobil has gutted the add package of thier high mileage symthetic.
Berryman in a can it will clean up an engine, 20 minute flush, but its a hostile toulene mix. pour in crankcase with engine cold* crank it, run 20 minutes, drain and replace filter.
I have seen some pics here, of others who used MMO in thier deisels, and pulled the valvecover off....SHOW ROOM floor condition looking engine.