- Jun 5, 2002
- Iowegia - USA
Some of the info is inaccurate and may be due to translation. Thermal stability-wise and shear stable-wise, polyol esters and complex esters rank the highest. They are more polar than PAO's. Any ester alone or any PAO alone will not be sufficient to work as a lubricant. One must add the appropriate additives to enhance the base oil for a specific application. No more generalities please. A discussion of a seal test is found on page 2 of this thread: http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=21;t=000058;p=2 As was stated in this thread, dispersants have can more of a dimensional effect on seals than do synthetic ester base fluids.