hugo393Questions(1)Answers(2)Posts(0)Comments0116 b-12 – When to use. Does it have to be prior to oil change.hugo393 answered 3 years ago • Throttle Body Cleaner | Fuel Additives / Treatments | Maintenance763 views2 answers0 votesBerryman Products 0116 B-12 Chemtool Carburetor, Fuel System and Injector Cleaner, 15 Ouncehugo393 answered 3 years ago • Throttle Body Cleaner | Fuel Additives / Treatments | Maintenance989 views2 answers0 votesCrop