Wynn’s Engine Flush Professional Formula Safe to use in modern diesel engines fitted with catalysts and Diesel Particulate Filters (DPF). These engines require an engine oil with a low Sulphated-Ash, Phosphorus and Sulphur content (Low SAPS). Contains effective cleaners that remove sludge and varnish. Suspends and removes deposits for improved lubrication. Contains Wynn’s Friction Proofing for engine wear protection. Assures engine efficiency. Protects metal parts from harmful contaminants during oil changes. Contains no harmful solvents, acids or alcohols. Cleans build-up from oil lines. Maintains oil protection.