Dont put clean oil into a dirty engine. Liqui-Moly Engine Flush Plus is designed to clean engine internals and remove harmful deposits, residue and sludge ensuring your new oil can offer the best performance possible. Engine Flush Plus will also break down sludge build up in oil galleries and pickups to prevent oil starvation and costly repairs. Liqui-Moly Engine Flush Plus can be used in all vehicles including petrol, diesel, and LPG. It is suitable to mix with all oil types including conventional mineral, semi-synthetic and full synthetic oils and wont damage engine gaskets, seals or bearings.