Supermarine 123 is a top quality marine diesel crankcase lubricant blended from highly refined base oils and a specially developed additive package to produce a moderately alkaline product having a Total Base Number of 12 and exceptionally high film strength. Supermarine 123 is particularly effective at preventing the formation of black sludge and is recommended for the lubrication of medium and high speed trunk type marine diesel engines operating on fuels containing sulphur levels up to 1%.
Supermarine 123 provides excellent engine cleanliness particularly in the piston ring area. Its alkaline characteristics prevent engine corrosion by neutralising acidic combustion products thereby providing long service life. While ideally suited to trunk piston engines with low oil consumption of modern design, Supermarine 123 can also be used in older engines.