Penrite Classic Oil 40W/70 Shelsley Heavy 5 Litres SHELSLEY HEAVY is a premium mineral, 40-70, high zinc, very low detergent engine oil designed specifically for petrol, kerosene and diesel fuelled vintage, pre-war and post war vehicles manufactured to 1950. It features a double layer of engine wear protection with high zinc and increased operating temperature viscosity over monograde oils. Can be used where the following SAE viscosity is recommended: SAE 50 SAE 60 Fuel Types Petrol Diesel KeSHELSLEY HEAVY is suitable for passenger cars, motorcycles, 4WD's, light & heavy duty commercial vehicles (trucks, buses & heavy equipment), tractors & industrial machines that originally specified a SAE 50 monograde grade engine oil fitted with/ without an engine oil filter. Those vehicles that require a higher detergency should use Penrite Classic Heavy Engine Oil. SHELSLEY HEAVY is a 40-70 engine oil for vehicles that specified SAE 50 grade engine oils. It is recommended for use in large engined vehicles operating in high ambient temperatures, or in vehicles with oil consumption problems. Ideal in large capacity sleeve valve engines fitted to such makes as Minerva, Mors, Knight and Daimler. SHELSLEY HEAVY is ideal for use in early vintage (pre 1950) motorcycles, incorporating sight glasses, pilgrim oil pumps and total loss lubrication systems. It is suitable for use in motor cycles fitted with a wet clutch. SHELSLEY HEAVY contains a special additive pack that suits vintage vehicles of the era and is compatible with grades that were originally specified. This oil exceeds the specification requirements of the original oils required during this period hence offering a greater level of engine protection compared to original oils.