just found this from a quick search so it seems its safe to use on a fsi
Features
•Can Decarbonize any Petrol/ Diesel Engine
•CRDI compatiable
•Heavy Duty Digital Timer
•Semi Automatic Pressure Control
•No extra electric connection requied
•Internal circuit protector
•Auto process complete warning and auto off
•Industrial grade quality hoses and fittings
•Quick couplers with automatic shut off valves to prevent fluid spillage
•All valves and QRC's are made in Italy and Germany
•Easy Hands Free Operation
Benefits To Vehicles
•Fuel saving up-to 15%
•Pollution Control up-to 50%
•Restore Power by 40%
•More AC cooling by 30%
•Enhanced Engine Life
•Smoother Vibration free ride
Benefits To Workshop
•High Profit with least investment.
•Dual Function Equiqment at the cost of One Machine.