I use it in my mid-90s car from time to time. I don't notice a huge difference, but I also tend to use good gasoline (Chevron or Shell).
I will say after beginning to use it 2x a year in this old car, I have NOT had a fuel injector go out. In the previous 10 years or so, I had to replace fuel injectors 2-3x times, I should have just tried some Techron.
I used it in 08 Mercedes for the first time today. Due to construction, I can't get to Chevron gas station very often for the next year, so I have to use Shell. Therefore, I went ahead and used some Techron concentrate today. I hope it will be ok, should be.
This is the *ONLY* additive of any kind that is actually approved by the strict Mercedes & BMW.
It won't affect a UOA will it?