the cars a 2.0 tdi bkd with 89k miles
I looked at the coolant today and realised it had lots of oil in it
I then checked the oil which was just on the minimum line. I topped this up and got home.
I changed the oil cooler yesterday and flushed the system until it was clear then again today
I drove today after clearing it and its all gloopy again in the expansion tank
Could this be the residue or what else