Answer SKF LGLT 2/0.2
This is a Norwegian product formulated for linear rail systems “low temp, small rolling bearings, high speed, low friction” available through SKF bearings for approx $55. 180g. Expensive but the best for the job, riding every weekend you will get 2 years from a tube
There is a product called “white lithium grease” from CRC. It’s great product, but I don’t feel its purpose is for the yeti rail system, the lithium is only a additive to the base oil product, the CRC product contains “advanced additive package” the “package” thins the grease and I feel is not up to the job.
Cross section of what we are playing with
http://www.chieftek.com/product-arhr.asp
Lithium grease
http://en.wikipedia.org/wiki/Lithium-based_grease
White lithium grease by CRC
http://www.crcind.com.au/catalogue.nsf/web_brands/White+Lithium+Grease?openDocument
P.s. Lithium-soap grease handles extremes of temperature quite well, which makes them highly suitable for both high and low temperature application. They have a dropping point of approximately 350ºF, and can be used in continuous temperatures of 300ºF. One reason for their successful low-temperature performance is that they are made with oil having a low pour point. In fact, lithium-soap greases have been used successfully at temperatures of -60ºF. Use of a lithium-soap grease at higher temperatures requires a different formula, however, the same grease can't be used at both extremes of high and low temperatures because the change would be in the viscosity of the oil used in the grease.
Basically, lithium-soap greases have very good stability; good water resistance, and are also readily
pumpable. They have a buttery texture and a brownish-red color.
Either way, take 30 sec after a big or wet ride, lubed it and it will last a lifetime!!!