Quote Originally Posted by 26 Inf View Post
I have used both Aero Shell 33/64 and Red and Tacky.

If you look at the Product Data Sheets Aero Shell provides more info, and is .mil and .gov approved. If you look at the common areas on the PDS's most of the ASTM numbers are the same. Pretty sure both are okay. Red and Tacky is easier to come by.

https://www.lucasoil.com/pdf/04_Grea...NTacky_PDS.pdf

https://www.shell-livedocs.com/data/...7d8a3ddeea.pdf
While some of the numbers are similar, some important ones are quite different:

Base Viscosity @40° C (cSt):
Red n' Tacky - 120
64MS - 14.2

Base Viscosity @100° C (cSt):
Red n' Tacky - 18
64MS - 3.4

4-Ball EP Load Wear Index (kgf):
Red n' Tacky - 500
64MS - 68