Scott, a while back I researched the weight of oil in the dashpot of my
Zeniths. I found in one of the manuals that it originally called for 20W
oil. I could not find 20W available anywhere. What I finally did was
purchase the "Carburetor Dashpot oil" sold by TRF. It looks thin enough to
be 20W and works well. It is expensive but I have not even used a quarter of
the bottle in 2 years of daily driving.
The purpose of the oil is to dampen the carburetor piston speed up and down
as you accelerate and decelerate. I figure that the if engineers who
designed the carbs specify 20W then that is probably the weight to use. As I
said, it works well. Cheers.
Art Kelly '64TR4 CT33118L (original owner-daily driver) w/ZS 175s
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