Short version. BMW 320i was burning 1 litre oil every 250 miles, had to add a litre every half tank of petrol. Now - 2 complete cycles later, no oil loss at all, massive increase in power, engine almost silent, smooth torque, perfect idle.
I added 2 bottles to crankcase, drove 7000 miles, oil consumption dropped to 1 litre every 450 miles. Rinse phase 8000 miles, oil consumption dropped to 1 litre every 750 miles. Another 2 bottles to crankcase - no change. After 8000 miles rinse phase. Oil consumption has dropped to zero.
Can't explain the difference to the engine performace, there is so much more power, it is so quiet, the torque is massively improved and perfect idle. The inside of the oil cap is spotless, you can read the serial numbers.
Incredible. Belief the hype, follow the instructions and be patient