Originally Posted By: Pablo
I could have used GL-4 MTG, but what you say is not what Subaru recommends. I believe a GL-4 may shift marginally better (certainly not proven), but I know a GL-5 will protect the gears better. Especially a 20 cSt@100°C GL-5. I don't think I realized at first how HOT this box gets. When I was doing the way bars the thing was scorching hot. I changed it cold and the fluid came out like alcohol. My guess is the Amsoil will shear as well, so it should end up in the 16 range and be perfect.
I'm curious, what interval will you be running on the gear oil?
I could have used GL-4 MTG, but what you say is not what Subaru recommends. I believe a GL-4 may shift marginally better (certainly not proven), but I know a GL-5 will protect the gears better. Especially a 20 cSt@100°C GL-5. I don't think I realized at first how HOT this box gets. When I was doing the way bars the thing was scorching hot. I changed it cold and the fluid came out like alcohol. My guess is the Amsoil will shear as well, so it should end up in the 16 range and be perfect.
I'm curious, what interval will you be running on the gear oil?
