2001 Boxster S - Oil in my antifreeze!? Need a new engine?

[uberalles]

Hello everyone, I am a independant dealer in Southern California. I sold a 2001 Boxster S to a customer a year ago, the car now has 38,000 miles on it and the owner recently took it in for service and they found oil in the coolant reservior. The coolant is foamy and brown. The shop says you need a new engine.

Is this a common problem? I know of the replacement engines in the early Boxsters as well as the 996 cars. What does it cost to have an independant shop repair the existing engine and/or replace the engine?

I want to help my customer with their car in as many ways as I can, I hate to see a car I sold die a year later (what is happening at Porsche engineering!?).

On a side note: this customer has many cars and plenty of money, he wants to know the feasability of swaping the engine with a 996 engine. Can anyone give me the short sumary of this swap?

Thank you much, Mark