How much oil Does it take

How much oil does the Pony on the 38 D2 require and the Diesel how much on that as well?

The Diesel is that a 15W-40?

Thanks
Jim

About 1 qt in pony to fill to upper line on dip stick,stopped. About 4 gals in diesel engine checked at low idle on level ground to upper line on stick.
No multigrade oiL,not designed for old engines!l! single grade oil 30 wt viscosity was USED PREVIOUSLY ,series 3 ,then 2105 military spec then changed to a CD rated ,now thats up dated , ask oil dealer for up dated spec
I am currently using Citgard 500 30 wt oil in my older Cat and JD engines.
Hope any of this is a help
Russ

I have a 1941 D2 3j that I just changed the fluids in. (oil)
Make sure you change the oil in the pony motor more often than in the big motor.
Gas from the carberator tends to find its way to the oil in the pony motor crankcase
and dilute the oil.
Just my two cents........👋
Tractorboy1