Molybdenum disulphide grease, also known as moly grease, is a type of solid lubricant with high oxidation stability and very low friction properties. It is used in industrial applications, especially as an anti-wear lubricant.

The addition of molybdenum disulphide to a lithium complex grease improves its lubricating capacity, thickness, resistance to lose and sealing/protection. This additive also reduces wear, oxidation and friction in metal-to-metal contact under extreme pressure or high heat.

SealXpert Hi-Temp Moly Grease (MoS2) based on mineral oils, lithium soap thickener and molybdenum disulphide is suited for high temperatures required at ironworks and cement plants. It is used for sliding, rotating and threaded parts in steel mills, rotary nozzles and bearings in ladle hangers and furnace dampers. It is recommended for transfer surfaces of tire liners and support rollers in rotary kilns at cement plants.

Graco does not make any recommendations for greases that fleets should use on their vehicles, but Graco Commercial Vehicles Applications Engineer Paul Cigala said that some technicians may want to consider using a moly grease when re-greasing a U-joint or automatic slack adjuster because of its strong anti-wear characteristics. However, he cautioned that some greases containing Moly can be soft when mixed with other thickeners.

Ultimately, molybdenum disulphide is not the grease of choice for heavy-duty trucks. Rather, the most suitable grease for heavy-duty trucks is one that meets the requirements of the vehicle manufacturer and the customer.