My manual on the 8540 specifies SAE No. 140 Hypoid Extreme Pressure
Oil. I picked up the Valvoline 85W-140 SAE gear oil and it specifies
that it is rated for hypoid gears and has EP additives. It also says it
is GL-5 rated, but it still does not say anything about its
compatibility with copper and bronzes.

Is this the same weight oil as the SAE 140 and does anyone have any
idea if it is safe to use in the Clausing mill?

Thanks, Steve

wrote:
My manual on the 8540 specifies SAE No. 140 Hypoid Extreme Pressure
Oil. I picked up the Valvoline 85W-140 SAE gear oil and it specifies
that it is rated for hypoid gears and has EP additives. It also says it
is GL-5 rated, but it still does not say anything about its
compatibility with copper and bronzes.

Is this the same weight oil as the SAE 140 and does anyone have any
idea if it is safe to use in the Clausing mill?

Straight-weight oils are typically GL1 or GL4 if memory serves, while
multiweights are more likely to be GL5

According to Valvoline product catalog, it says it's recommended for
manual transmissions, so it' must be OK for brass synchro rings.