I own a 2015 3.0 Ecodiesel with 64,000 miles. What, or should I even use, for a fuel additive to keep the injectors clean? Some people have told me to add Automatic Transmission fluid to help lubricate and clean the injectors. I am not feeling good about doing that, although years ago, Transmission fluid was added to the crankcase to help clean out the sludge in the engine. Let me know what you use to keep the injectors clean.