engine oil in the coolant at my last 90 000 k service. Help!!! on 2007 Kia Rio

Mechanic says it needs a new engine - but it still runs fine????

Asked by for the 2007 Kia Rio
Some oil in the radiator is what you are saying? Auto. trans?
No not in the radiator - in the engine coolant tank. And the car is a manual transmission.
If it is in the tank then it came from the radiator that is what the reservior is hooked to!! Unless someone put oil in the tank! Any coolant in the oil?? Should be.
I will check in the morning - but since it got cleaned out and refilled with new coolant it has been fine so far???
Just keep a check on it, i wouldn't replace ahything without confirmation of what's wrong, if anything! Oil level is the most important that it is not to full or low.