Hi there guys, Just thought I would let you know my experience with this oil additive. I put 250ml in my Audi Quattro and felt a difference. The most noticeable effect is the reduction in engine braking, it seems to coast far longer (which I suppose is how the would formulate their claim for friction reduction?). Power has increased slightly maybe by 2-3%. Also requires less throttle input for climbing hills and cruising about. Put approx 20ml in with the central hydraulik fluid (steering/brake boost) and it has stopped the majority of the pump noise, and the pump no longer groans.. I didn't service it or change any variables, just curious if other people have had similar results? The brand I used was Liqui Moly. BTW - Do these additives reduce compression?