I am starting to work on my 1921 R10 5 ton truck, I see the Dual cap distributor has the same alum. body as most early 20’s Pierce arrows. Can someone tell me what the correct modern oil/grease is used in the lower sump? The original filler cap has the word “grease” on it. I see there are two “full” level screws on the side to allow fluid? to drain from when it’s full. Thanks, Karl
Use SAE 140 gear oil