That’s what went on my car with the old owner. Water pump went bad, coolant mixed with the oil. They had to rip the whole engine apart and rebuild. The Countach tech said to me it should be checked every two years and just to be safe you should have the seals replaced. He referred to it as the weak spot on the engine. He said he has seen this happen on a few ct's he has worked on. That shop gave a two year parts and labor warrantee on the engine. It cost $40,000.00 for the job.