it work OK, it still needs to be more user friendly, I hated to see MS money go away, now I hope that Quicken becomes more user friendly and if the price came down some I would buy the updates every year just to see if they overcame their burdensome.

It worked, at least for me, I have a 2011 Tiguan with 55000 mi on the odometer, lately It was having rough idle and loss of power,also a couple of MIL (Check engine light). After reading some reviews and watching some youtube DIY videos I decided to give this product a try. I put half bottle on the crankcase and run the car for about 100 mi, and sprayed it using a hose and an inflator needle through the air intake temperature sensor, let the engine stall and leave the product soak for a couple hours . After that I drove the car for 15 min and watch a lot of white smoke coming out of the exhaust. I repeated this procedure 3 times (half bottle each time) . I changed the oil afterwards.My car now runs smooth and no more Check engine light. Planning to repeat this decarbonization procedure after 4000 miles. I do recommend this product