Oil dripping from the air cleaner and filter is oily
 

My 79 240D is dripping oil from the air cleaner. When I open the oil cap there is a strong blowby. The car runs fine and is starting OK. The mileage is 250k miles. I got it when it was 180k. I also own a 78 300D. I need some suggestion what to do.

I noticed the same thing this weekend on my car,anyone have an idea.Could it come from the vacuum pump line?My K&N filter is dripping oil:(

Anyone have any ideas?
 

I'm still wondering where this oil is coming from,is it blow-by coming up(?) the intake manifold? The inside (clean)of the air cleaner is spotless,no oil grime at all.The outside was caked with grime,black as diesel oil.I could still see the red K&N filter oil on the upper 2/3 of the air cleaner.My car doesn't use more than 1/2 a litre between oil changes so I'm :confused: