Review on Liqui Moly 2001 Valve Clean by Edy Yukface

I use this every 5000 miles or so on each of my cars: 2004 BMW E46 M3. 2006 Audi B7 A4 Avant 2.0T FSI and 2014 Nissan 370Z Touring Coupe. The Audi 2.0T FSI engine had insane idle problems, even after a full timing belt overhaul. There was also a noticeable loss of power in the medium speed range. The first round of this stuff, after filling a nearly empty gas tank with this additive, went quite hard through the first half of the tank. You can smell carbon deposits in the intake chambers burning along with the rest of the fuel going through the combustion! Once the tank is empty, refill it - fuel economy improves from a high 20 to a mid 30 seconds. In combination with the new ECS air intake kit, around 40 mpg is easily achieved when driving on the highway! Mid-range power dissipation has largely returned. I think it definitely helped clean the intake manifold and will help keep the plenums clean for years to come! Better to use this from time to time than physically removing the intake manifold and cleaning out the chambers!