there are sevral kinds of additive that work for different purperts: - S) ~2 M9 v/ v0 O0 v* L6 N
1 injector cleaner will clean the injector, if your car has high mileage, you can try it.0 B: |$ g; z( ^$ e4 h2 _
2 fuel system cleanner, for older cars - o# V) B$ u5 x3 octan enhancer, to increase octan value of fuel, you can use it all the time * d9 Q1 B* k% r/ s4 fuel stablizer) i! P0 Y4 A, P+ M% P: m1 ?; _ w/ G
5 fuel water condenser, to remove water in your fuel tank
in my opinion, if your car is old enouth, you should choose the first, the third and the last one from time to time, I use those regularly.7 f9 D; N/ E, `8 S! s, P