Lubricants developed for four-stroke marine diesel engines operating in standard or severe conditions burning distillate fuels. Formulated with highly refined base oils and selected additives. The unique combination of antioxidants provides high resistance to oxidation and thermal degradation. The powerful detergent and dispersant additive system ensures excellent base number retention, piston cleanliness, soot handling and prevents the corrosive wear. This results in a cleaner crankcase, much longer drain intervals and lower maintenance costs.