17A slinging oil while idleing

I'm still thinking on that one but got to ask if that unit still has the common oil system where the pony gets it oil supply from the main engine?

Don't know that one, but I believe the big motor's the one slinging oil. There's a small hole in exhaust manifold and oil is all over pony plus coming out of exhaust stack.
Also . do you know how much oil to add to main engine when oil level is at the add mark on the dipstick?

Well here's my thinking (it's early and my coffee hasen't kicked in yet)
I suspect you have a hole in the internal heat exchanger section of the intake manifold. If you have a flapper valve on the pony exhaust stack this would allow the main engine to pull a suction on the pony exhaust and possibly draw oil from the pony, especially if it has the combined lube system where there is an endless supply of oil from the main as long as it is running. The pony oil level is maintained by a stand pipe in the sump and passage back to the main sump. This is a gravity feed that would be upset by negative pressure.

If the pony is the self contained lube conversion the oil supply would be limited to what's in the sump and less likely to be drawn into the intake but I suppose it's possible.

What are your oil level observations? Are you loosing oil from the pony and/or main?

You can check for the possibility of a hole in the manifold by putting a rag or piece of paper (or hand) over the main engine exhaust pipe while running the pony with main engine stopped. There should be no flow detected.

Can't think of any other source of oil in the intake other than oil bath air cleaner.

Don't have a known quantity to bring main oil level from add to full.
Instructions are to add oil until full while engine is running.

From the way I read it your main engine is slobbering and pushing oil onto the pony motor.

Slobbering is caused by excessive idle time and not enough work. The cylinders get glazed up and the rings aren't steating well. Take your machine and work it under high loads for a few hours. Should clear up the slobbering. And don't idle the main engine any more than you have to.

If your engine is slobbering, add Marvels Mystery Oil to the fuel at the rate of one quart to five gallons of fuel before you take it out and work it. MMO helps break down deposits and free up the rings. Hopefully you won't be tearing it down.

it could also be unburned fuel mixing with soot to appear like oil. mine will do that in colder weather and leak out between the turbo and the exhaust pipe. By the way my pony has a self contained oil system on my 17A. also i think it takes about a gallon to bring it to full from add.

Of the machines I've been around I have never seen a starter motor share oil supply with the big engine. However from this discussion it appears that is not always the case.

Please enligten me. How do I know which is which by observation?

it could also be unburned fuel mixing with soot to appear like oil. mine will do that in colder weather and leak out between the turbo and the exhaust pipe. By the way my pony has a self contained oil system on my 17A. also i think it takes about a gallon to bring it to full from add.