Liqui Moly has a very good reputation and continues to be consistent in every product I have purchased. It was used in an Audi A4 where the gear changes had started to become a bit problematic (the previous owner had not changed the valve oils since he got it) and I noticed various issues. Now the gear changes are smoother and the transitions from reverse to parking are easy, whereas before it was a bit difficult. I also used the corresponding additive that Moly offers in a tube.