I purchased your Engine treatment for my 2004 VW Touareg, V-8 and am quite happy with an increase of between 10% to 12%, seems to vary but the SUV is heavy and has a 310 HP engine that I like to use. In our conversation you said if I was to try the transmission treatment I would see additional improvement. In checking there is nowhere to add the fluid the transmission is sealed. So I decided to take your advice and leave it alone. I am getting better gas mileage and enjoying the savings. Thanks.