Ironically, ethanol based fuel injector cleaners were removed from the market because they were determined to be corrosive for some metals, including Aluminum. Techron concentrate (with PEA) contains no ethanol, cleans and protects against ethanol corrosion and the buildup of sulfur. This concern is mainly for "older" engines, new engines are designed around E85, winter summer blends, etc. So I guess it depends on the age of the engine, whether or not to use a PEA product.