I just watched another documentary about additives. I personally in all the years i´ve trucked and all the miles i´ve driven have never used ANY type of additive (diesel, gas, injector oil etc). I´ve always maintained my equipment with the thrust bieng on clockwork oil changes at 10,000 miles truck. 3000 miles car. I have NEVER had an engine failure. My maintenance failures were always peripheral systems (air,fuel, hydraulic, tires, cooling etc.) According to the documentary, which is also something i have believed for years, additives are nothing more than bunk, designed to get us to buy all the crap they put out, to increase corporate bottom line. A case in point is injector cleaner for todays engines...doesn´t do a thing according to the experts. Injectors need replacing no matter what you do. They just wear out or go bad. Comments.