Tom, Email
I have a TDI diesel. On the VCDS program, I observed that actual turbo boost, was drastically lagging behind specified boost. Actual boost seemed fixed at 989mlb. After putting two bottles of Cataclean in 1/2 tank of fuel, and running the car for about half an hour, I watched actual boost gradually increase to 1020mlb. Then after letting the car set a day or two, actual boost was reaching specified, only with a bit if lag. Finally, I tested exhaust back pressure, and it was so low it didn’t even register on the gauge. Additionally, the car is running as smooth and quietly, as the day I bought it new. Thanks for a truly great product!!