Join Date: May 2008
Location: Spokane WA USA
Car: 2007 Outback XT Ltd
Feedback Score: 0 reviews
Most likely a head gasket has gone. If your buddy really wants the car, take it to a mechanic and have him check for combustion gasses in the coolant using an emissions sniffer, while the engine is running at full operating temperature.
If the test is positive, forget that car, or work the cost of a double head gasket repair, and possibly head replacement, into the deal.
Bubbles aren't necessarily a deal breaker, but they sure are a danger signal! Unless it was an especially cherry car and I was prepared for the hassles, downtime and expense of major repairs, I would look at other vehicles.
Spokane WA USA