Want to use B-12 in lawn mower – is it safe? October 23, 2012 Solutions Central › Want to use B-12 in lawn mower – is it safe? 0 Vote Up Vote Down BPfan Staff asked 12 years ago Can B-12 be used in my lawn mower without harming the plastic parts in its carburetor? 1 Answers 0 Vote Up Vote Down chemtooler Staff answered 12 years ago Yes! It is safe as long as it is properly diluted at 1 oz. per 1 gallon of gas. Please login or Register to submit your answer Username or Email Address Password Remember Me