Lucas oil heavy duty oil stabiliser is an additive designed to massively increase the performance of your engine or manual transmission oil. It is beneficial to both new or worn engines / transmissions and blends with all petroleum based oils.Protects against wear from cold startsReduces smoking, knocking and oil burning in worn enginesRaises oil pressure and increases lubricity to prolong component lifeExtends oil life by up to 50%. Less frequent oil changes saves you moneyUse heavy duty oil stabiliser in your engine, manual gearbox or differential to reduce wear and increase component service life. The increased lubricity can also improve fuel consumption and promote smoother running. It keeps old engines alive and new engines like new for longer. How much to use:For most engines use 20% stabiliser. For badly worn engines use up to 80% stabiliser.For manual transmissions and most differentials use 25-50% stabiliser. For badly worn differentials use 50-100% stabiliser.1 Quart (0.946 L