what is grease in
Applications Suitable for Grease Grease and oil are not interchangeable. Grease is used when it is not practical or convenient to use oil. The lubricant choice for a specific application is determined by matching the machinery design and operating conditions with desired lubricant characteristics. Grease is generally used for: 1  Machinery that runs intermittently or is in storage for an extended period of time. 2  Machinery that is not easily accessible for frequent lubrication. 3  Machinery operating under extreme conditions such as high temperatures and pressures, shock loads or slow speed under heavy load. 4  Worn components.