Engine Flushers Put to the Test: Which One Cleans Best | Revolutionary Engine Flusher Testing: Boost Performance Now An engine flush is a procedure that involves cleaning the internal components of an engine, including the oil passages and various parts, to remove sludge, debris, and contaminants that may have built up over time. It's important to note that engine flushing is not a routine maintenance procedure and should only be performed if you suspect significant sludge or debris buildup in y