Noticed an oil leak under air cleaner and clear line from vac pump was black. Opened air cleaner and it was oily inside with filter wet with oil. Temp rerouted air line to ground and ran it, leaves a puddle of oil on ground.

My assumption is the diaphragm is broken allowing oil to exit the pump via the outlet line. But thus far the vacuum seems to be working fine.

Assuming the oil level is kept in the normal range, is this a drivable thing?

Is there likely something more serious than the diaphragm (standard rebuild kit) broken?

Two-hose type pump, 79 240d

Is it true that the newer single hose pumps can no longer be rebuilt?