See what has been called "the MolaSoak", Molakules (member #59) recipe for de-carboning.
I have used it several times, now, on a 31, 24 and 5 year old car, and it is a good start to the long-term process. I last used MOPAR COMBUSTION CHAMBER CLEANER, soaked each cylinder of a 3.5L Oldmobile V6 ("Shortstar", in honor of its Northstar architecture).
My folks bought this car with about 75k on it (now has 82k), and oil consumption is unacceptable at 750-1000 miles/quart.
After plugs were removed, 2-ozs of LUBE CONTROL were allowed to soak pistons for several hours. Little remained. I went out and fogged the neighborhood afterwards.
Car will have ARX cleanup done after several thousand miles of LC/FP cleaning.
It has worked well for me in a 185-190 psi Ford 6, and a 120 psi Chrysler V8 383 highly sensitive to todays cat-**** gasoline.
Directions are in an old post. Soak each cylinder with 3-4 ounces of LC, turn over engine manually after about an hour, and let sit overnight. (Remove any not soaked through rings prior to startup). Install new sparkplugs after running at high idle for 20-minutes next day, and change oil and filter.
Continued use of LC and FUEL POWER will keep problem in check and should gradually lessen it.
I also use the LC soak in our '01 Jeep L6-242 annually prior to ARX cleanup. Motor is better than new with 90k now approaching. Zero oil consumption even with 8k+ oil change intervals.
