Part #0116 B-12 Chemtool Fuel Injector Cleaner is our flagship fuel additive, great for everyday usage for cleaning fuel injectors and intake valves.  We recommend using 0116 every third fill up. Part #7516 B-60 High Mileage Fuel System Rejuvenator is our best detergent-based additive and thoroughly cleans fuel injectors, intake valves, and combustion chambers.  Under normal circumstances, this only needs to be run every 10-15K miles, but there’s truly no such thing as “too often.”