Hi!
I don’t know much about cars, but I have a 1997 Kia Pride Pop (I don’t know if you have this car in the USA) and I was having problemas with gases, so I tried the decarbonizing with water.
The thing is water never came out from pipe, so I decided to stop. I think I might put about 40 ml. Anyway the car continue working fine, but I’m not sure the dicarbonizing worked.