How often should you put #0116 B-12 Chemtool in your tank? October 23, 2012 Solutions Central › How often should you put #0116 B-12 Chemtool in your tank? 0 Vote Up Vote Down BPfan Staff asked 12 years ago How often should you put #0116 B-12 Chemtool in your tank? 1 Answers 0 Vote Up Vote Down chemtooler Staff answered 12 years ago Every 2,500 to 3,000 miles, or whenever you do an oil change. It should also be used to revive stale gas and disperse moisture in gas as needed. Please login or Register to submit your answer Username or Email Address Password Remember Me