My reference guides don't go back that far. I will contact my resources on Monday and see what they tell me.
I've got a couple of pressure washers that need non detergent oil. I think I bought mine a Autozone.Non-detergent oil is still available. At our local farm stores they still have SAE 30 and 10 in some places. Try mystik.com they still make it.
Ultrarunner-
Talked to our chemist today. He says the detergency and friction modifier packages will not harm antique cars. There is no reason why you would not be able to run todays multi-viscosity oils. The friction mod packages will cause no harm to the Babbit bearings nor will the detergrncy package harm seals.
The Schaeffer Supreme 7000 in 5w30 or 10w30 will work.
If you have specific concerns about a multi-grade oil in these cars, please feel free to contact me.
One thing a equipment dealer told me, don't know if it is true or not, maybe someone here can answer. We have a 4020 that we ran Deere 30wt oil in and still do. His newer Deere needs 15-40 engine oil. When asked if we could run both tractors on the 15-40 they did not think it was a good idea. The reason being the 30 wieght was non-detergent oil and that there was probably sludge in the engine in areas. The 15-40 they thought would wash this sludge out and take a chance on plugging oil passages in the engine. They recommened waiting till we rebuild the engine then go with 15-40.
Does this sound right or were they incorrect?
lots of equipment that does not use an oil filter also does not use detergent oils.
look at lawnmower engines and air compressor oil sumps.
remember detergents suspend stuff for filtering..
soundguy