Lube King's non-detergent oil contains no additives and works well in engines built before 1930, engines that operate in the mildest of conditions, and applications that specifically call for non-detergent oil. If you have an engine that has been taking non-detergent oil for its whole life, it's a good idea to continue using non-detergent oil unless you're doing a total overhaul, as oil with detergents will stir up the particles that have been settling for years with non-detergent oil. | Lube King Non-Detergent 30W Motor Oil | Size 2 gal