Ensuring you are Ready for the Road Ahead , the GUNK Engine Brite Original Heavy Duty Engine Degreaser prevents road grime, oil, and grease from depriving your engine of its best performance. This heavy duty engine degreaser is one of the best-selling engine degreasers that instantly removes difficult oil, dirt, and grease from hardworking, leaky engines. FleetPride is your First Click in Heavy Duty .