MC-4 HD 50 is designed for use in four stroke road & sports bikes, dirt & enduro bikes, ATV's/Quad bikes and scooter that require or specify a straight SAE 50 mono grade engine oil. It is also equally suitable for use in transmissions with wet clutch systems where engine & gearbox oils are combined. It has optimum clutch slip prevention in these systems.

MC-4 HD 50 is suitable for use in many older motorcycles. These include Harley Davidson motorcycles made before 1984, Pre 1985 Ducati's as well as many "Classic" motorcycles such as AJS, Ariel, BSA, Douglas, Indian, Norton and Royal Enfield and many more.

MC-4 HD 50 may also be used in many other engines and gearboxes that require SAE 50 grade engine oils. It can also be used for older worn engines or those burning excessive oil that originally specified SAE 30 or SAE 40 grade engine oils.