Grease: SHC-100 vs Mobilgrease 28

[Narwhal]

For wheel bearings, elevator tube & jackscrew, and tailwheel bearing the airplane maintenance manual for my experimental Cub specifies Mobilgrease 28.

The manufacturer of the tailwheel parts specifies SHC-100 grease, contrary to the airplane maintenance manual.

Which one should I use, and does it matter? Airplane does get flown on skis and wet environments with penetration wheels attached, but doesn’t go out much below —20F.

 

[Bell206]

Which one should I use, and does it matter?

If you want to stick to one grease the 28 is just fine. There's been a shift toward 100 for various reasons with both having their pros/cons. However, do not mix them as 28 is clay-based and 100 is lithium based.

 

[Mikey52]

Lithium tends to breakdown in water.