I'm new to these boards, and would appreciate some advice from you Volvo veterans. Recently, I brought my 2006 XC 90 AWD (103,000 miles) in for a service (standard 105,000). The car has a really good service history and was under warranty until 100,000 miles. Last year, the mechanic, who is a Volvo specialist had me replace radiator and service to the tune of $2700 (I didn't realize the car was still under warranty and forked it out); this year the brake pads and battery to the tune of $1600. In short, the car was working great when we brought it in -- I just wanted a normal service because we were planning on driving to Tahoe and wanted the security of knowing everything was running well. So, I pick up the car and bring it home after service. In my first drive after taking the car home (on the way to Tahoe), "low oil pressure light" goes off -- the car is also making a weird whirring sound and having trouble accelerating beyond 40 MPH. As a reminder, I've never experienced any of these problems with the car. No Volvo specialists were open, so I stopped at a Jiffy Lube to check the oil. The attendant there checked the oil and informed me that the mechanic who had serviced my car had overfilled the oil by 2 quarts. He drained it to the correct fill line (I saw the dip stick with my own two eyes) and off we went on our journey. About 10 minutes later, whirring sound starts kicking in and huge amounts of exhaust come billowing out of the car for the first time in its entire history. We pull off and have car towed to same mechanic. After some back and forth (including sharing my service records with him), he tells me the turbo needs to be replaced due to "Normal Wear and Tear" to the tune of $3800. He would take no responsibility for the overfill of oil. I've called several Volvo dealers and they all think the timing of this is suspicious and that they almost never have to replace turbo engines with this car -- one dealership had never had to do it at all. I've since moved the car to the dealer's service station -- the dealer price to fix the turbo is $1000 less than the mechanic, which strikes me as odd.
One more thing, when we had the car serviced at this mechanic at 97,500 miles, he told me the brake pads had 90% life in them. This year, at 103,000 miles, he told me the brake pads should be replaced and have less than 30% life in them. Small, but is that normal?
What are your thoughts, specifically about the turbo? And, should you find the circumstances as suspicious as I do, do you have any suggestions for next steps? I've already written everything down and reported to the Bureau of Automotive Repairs.