Thanks. I wondered about the cats too as they should not be dead at that mileage. I wonder if a shop took advantage of the owner though. I was told that the ICV assembly at the back of the intake started leaking and oil was allowed to get into the Cats and ruin them. That is why they were changed. Is that plausible?

I wonder if a shop might have taken advantage of the owner - he is a car guy but not as knowledgeable on BMWs.