GW ProMarine Series – a range of premium quality marine crankcase lubricants produced from high quality mineral oils and special additives for high output, medium-speed trunk piston engines. GW ProMarine Series exhibits outstanding oxidation and thermal stability, and has also been used as cylinder and bearing lubricants in marine and industrial diesel engines operating on distillate or residual fuels. These oils containing relatively low ash additives, imparts high level of dispersancy, detergency and anti-wear properties. Good demulsibility characteristics ensure ready separation of water from oil in the event of accidental introduction of water into the engines. GW ProMarine Series Lubricants are available in two viscosity grades (SAE 30 and 40) and in various BN (Base Number) values ranging from 12 to 40. They have excellent TBN retention and resistance to viscosity increases over long operating periods. The ProMarine 330, 340, 430 and 440 grades may also be used in engines operating on residue fuel oil of up to 4.5% sulphur.