The Stovebolt Site Forums The Shop Area General Truck Talk Fluid specs for my 1937 GMC/Chevy 1/2 ton

I use Valvoline 15w-40 diesel engine oil. No additives. I now have over 95,000 miles on the 1954 235 in my '46 truck. Engine was rebuilt in 1986. No oil consumption, no smoking. Gets driven about 3,000 miles a year.