There are many fuel additives like STP and or some very expensive ones on the market to add to your gas tank to help clean the tank and engine and so called help the engine run better. Do they really work or is this a waste of money and also if they do work what is the best one to buy?

Fuel additives to clean gas engine?

ag_ghost March 9, 2011, 3:00pm 2

If you’re not using brand-name fuel, it’s not a bad thing to add a bottle of Techron every 3,000 miles or so. Put it in before filling the tank.