The best fuel injector cleaner as of 2015 is Lucas 10013 Fuel Treatment, according to Fuel Injector Cleaner Review, a website that compares competing brands in terms of effectiveness and cost. The brand garnered a rating of 4.7 stars out of 5 for use with gasoline and diesel engines.
Lucas 10013 Fuel Treatment is also good for the budget-conscious. A one-gallon jug costs less than $50. It is effective at neutralizing the deteriorating effects of low sulfur additives in diesel fuel. It is also a good replacement additive for leaded fuel engines, as it can emulate the benefits of leaded gasoline without emitting hazardous fumes.