ATF in the Diesel Tank: Folklore, Function, and Fuel System Consequences
The practice of adding Automatic Transmission Fluid (ATF) to diesel fuel has long circulated in equipment yards, truck stops, and mechanic shops. Some operators swear by it as a way to clean injectors, lubricate fuel pumps, or improve cold-weather performance. Others warn that it’s outdated, unnecessary, or even harmful to modern engines. This article explores the origins of the ATF-in-fuel myth, its mechanical implications, and real-world anecdotes from the field.