The advantages offered by synthetic oils are most notable at either very low or very high temperatures. Good oxidation stability, higher viscosity index and a lower coefficient of friction (with some synthetics) allow operation at higher temperatures. The higher viscosity index and lower pour points permit operation at lower temperatures.

 

Join us in Branson, Missouri, on Jan. 31-Feb. 2 for Machinery Lubrication I training.

From "Machinery Failure Analysis and Troubleshooting"

 

Misalignment is a common source of premature spalling. Misalignment occurs when an inner ring is seated against a shaft shoulder that is not square with the journal, or when a housing shoulder is out-of-square with the housing bore. Misalignment arises when two housings are not on the same center line. A bearing ring can be misaligned even though it is mounted on a tight fit if it is not pressed against its shoulder and thus left cocked on its seat.