On my 380sl, the area under the power steering pump pulley, the ignition coil cover, and the vacuum lines to the charcoal canister have been oily for some time now. Since I recently replaced the front, main seal, and the rest of the engine is dry, I suspect the oil must be coming from the front, pump seal.

However, the pump doesn't have a crank case connection, and the oil doesn't look like power steering fluid. Moreover, it's been leaking for some time now. So, before I start replacing the front seal, I just wanted to make sure that the oil was in fact coming from that seal.

Does anyone happen to know how to confirm this, and/or how the pump shaft is lubricated?

Thanks in advance.