Which type of oil is needed for Sleeve Bearings?

The choice of oil for sleeve bearings typically relates to the viscosity and flow characteristics needed to ensure proper lubrication. Sleeve bearings, which are designed to support loads and allow for smooth rotation, require oils that provide adequate film strength and stability under varying temperatures and loads.

SAE 20 or 20W oil usually provides a thicker viscosity when compared to lighter oils like SAE 5W-20 or 10W-30. The "20" designation indicates that the oil has a relatively high viscosity at operating temperatures, making it suitable for applications where load-bearing pressure is significant and where a thicker lubricating film is necessary to reduce friction and wear. This can be particularly important in sleeve bearings, which are under continuous load and need to minimize metal-to-metal contact.

Using a thicker oil can help in maintaining a stable lubricating film in the presence of high pressure and temperature, which is crucial for the longevity and performance of sleeve bearings. Lighter oils may not provide the same level of protection under these conditions, leading to increased wear and potential failure of the bearings.

Thus, the selection of SAE 20/20W for sleeve bearings is appropriate due to its ability to maintain adequate lubrication and protection under a wide range of operating conditions.