Started ARX treatment on 1989 Mercedes 260E with 102,000 miles. The car burned a quart of oil every 700 miles before treatment started. Now about 700 miles into the cleaning phase the car has burned 2 quarts, probably from cleaning the valve seals. It starts much easier and runs well. I did notice that upon removing the oil filler cap fumes were being released which did not happen before. The oil on the dipstick still looks clean. If anyone is interested I'll keep you posted.