NISOTEC DIESEL S-3 SAE 20W-50 is a mineral multigrade engine oil intended for the lubrication of four-stroke diesel engines of older constructions of trucks, agricultural, construction and similar machines, which work in moderate conditions, with variable loads. It is especially recommended for lubricating engines that have traveled a large number of kilometers or hours of operation, with increased oil consumption and reduced compression, or that operate in conditions of elevated external temperatures.