The Standard Grease in Cleavland wheels is the synthetic Mobil SHC 100. Per Cleavland maintenance manual;
"A. Bearing Grease
CAUTION: DO NOT MIX AVIATION WHEEL BEARING GREASES WITH EACH OTHER. IF USING OTHER APPROVED GREASE, COMPLETE REMOVAL OF CONTAINED GREASE AND BEARING CLEANING IS REQUIRED. REPLACEMENT OF PREVIOUSLY LUBRICATED FELT GREASE SEALS IS ALSO REQUIRED.
CAUTION: THE FOLLOWING GREASE CHANGE DOES NOT APPLY TO AMPHIBIOUS APPLICATIONS NOTED IN TABLE A4.
Beginning March, 2007 all active wheel assemblies listed in Table A4, except those noted for amphibious application, will be shipped from the Cleveland Wheels & Brakes facility with the bearings packed with Mobil Aviation Grease SHC 100, the approved preferred grease for all Parker Hannifin wheel assemblies."
Before this Aeroshell 22 was the standard grease in use. The only exception is wheels for amphibous aplication which use BG Producs, HCF Grease, P/N 605.
Here in Alaska many maintenance shops, including Aerotwin a Cessna Dealer, have switched to using TRC 880 C&C
http://www.texasrefinery.com/pdfs/LB...wn&chassis.pdf in all wheel bearing but especially wet/amphibous aplications. I have seen about 3X bearing life using this grease. In certified aplication this is a minor alteration requiring a log entry but in experamental aplications just go for it. Good luck, Russ