AGIP SIGMA TURBO PLUS is formulated from a premium performance additive package and selected base oil to give a long-drain service (SHPD oil) of the latest generation for supercharged diesel engines operating under severe duty, notably those of recent technology (“EURO 3÷4”) according to engine manufacturer specifications. The oil can also be used in normally-aspirated diesel engines installed in vehicles engaged on urban and short-haul goods and passenger service, providing a very wide quality margin.