2005 Sprinter 316 CDI oil in water.
 

I have found oil in my radiator and i dont know where its coming from.
oil level is down, no water in the sump. no milky colour, no smoke.
oil is coming out of the radiator overflow.

any suggestions?

theres oil in the water, not water in the oil.
can it be the oil cooler or water pump?

thankyou

i just hope my mechanic doesn't charge me for un-needed repairs

would the oil exchanger have anything to do with it?