03/10/2026 by Joel Thompson
Lubrication is a vital process that affects the reliability, performance and service life of industrial equipment. Grease is a semi-solid lubricant that stays in place even when components are moving or exposed to moisture, and is available from a range of market-leading manufacturers, such as Texaco and Total. However, selecting the correct grease for an application is extremely important, as the wrong choice can have numerous negative consequences. These include metal-on-metal contact, overheating, complete bearing failure, increased mechanical downtime for maintenance and costly repairs.
Among the greases used in industrial environments, two types are frequently used: extreme-pressure (EP) grease and lithium grease. Although these options are often mistakenly believed to be interchangeable, each is specifically designed to work under particular operating conditions.
Here, we explore the differences between EP grease and lithium grease to help operators make an informed choice when ordering a lubricant for their application.
What is extreme-pressure (EP) grease?
In simple terms, EP grease is a specialised, heavy-duty lubricant containing special chemical additives. These help to protect metal components from shock impacts, high levels of friction and intense loads.
What is lithium grease?
A multipurpose product, lithium grease is a semi-solid lubricant. Its formula includes a base oil combined with a metal (lithium) soap, which acts as a thickener, and protective additives that enhance its performance.
Understanding the key differences – EP grease vs lithium grease
EP grease and lithium grease have similarities that can lead to them being mistakenly used for the same applications. For instance, both can have a synthetic or mineral oil base and can include thickening agents such as lithium soap and other additives. However, they are designed for different purposes.
Load capacity
Extreme-pressure grease includes special EP additives that help to prevent metal-on-metal contact under high pressure and heavy shock loads. In comparison, standard lithium grease is not designed to handle such conditions. It can cope with normal, steady loads, but when subjected to extreme levels of stress, it breaks down much faster than EP grease.
Versatility and price
While EP grease and standard lithium grease are both highly versatile products, lithium grease is a more budget-friendly solution for general automotive maintenance and workshop tasks. EP grease is more expensive and is best purchased when its valuable properties are essential rather than when price is the primary consideration. However, its powerful formulation can save users money in the long term when operating heavy machinery, as it prevents expensive downtime and improves productivity and profitability.
Environmental conditions
EP grease resists vibration and stays in place in demanding outdoor or wet conditions. In moderate temperatures and conditions, lithium grease offers good mechanical stability and water resistance. However, in wet and harsh outdoor environments, or in applications involving considerable vibration, EP grease can remain in place, making it a dependable choice.
When should you choose EP grease?
When an application involves machinery exposed to continuous vibration or heavy shock loads, EP grease is the best option. It is also a smart choice for lubricating high-stress bearings. These parts are inherently difficult to lubricate effectively, but applying EP grease can drastically reduce relubrication frequency, improving mechanical and site efficiency.
EP grease is commonly used for hard-working equipment operating outdoors or under severe conditions in sectors such as agriculture, construction and mining.
When should you select lithium grease?
When operating loads are steady and light to medium, lithium grease is a suitable choice. It is also ideal for a wide range of common automotive jobs.
Versatile and affordable, it is suitable for lubricating electric motors, hinges, locking mechanisms and general workshop tools.
Before deciding on a grease for an application, always begin by consulting your equipment manual for the OEM recommendations you need. Check that the grease you choose is compatible with all materials present in the machinery, and consider the operating environment in which the grease will need to work.
You may also interested in:
Is dielectric grease safe for rubber?
Today, there is an extensive array of general use greases available to purchase from trusted manufacturers like Molykote and Fuchs.
The difference between PTFE grease and lithium grease
Lubricating grease is a viscous, semi-solid lubricant that offers numerous benefits like reducing friction, remaining in position on moving parts and blocking dirt and rust.