I own a 99 S80 T6. I bought it used with approximately 80K miles and now have about 130K. I have put a lot of money into this car. While the engine, drivetrain, transmission, etc., have been reliable ...
I own a 99 S80 T6. I bought it used with approximately 80K miles and now have about 130K. I have put a lot of money into this car. While the engine, drivetrain, transmission, etc., have been reliable the suspension and various electronics have been problematic. My biggest complaint is that any repair, no matter how small, end up being really expensive. Example - my glass on my headlight cracked. You would think you could just replace the glass, but you can't. Rather, you have to replace the entire headlight assembly and they need to drop the front bumper to put it in. The part at the dealer is approx. $500 and labor around $200. So it costs me $700 to replace a piece of broken glass! There are many other examples but you get the picture.
The T6 version has turbo and is reasonably quick for a large sedan. It gets decent gas mileage on freeway/highway (around 25 mpg)... though not great in the city (probably around 15 or 16 mpg). Handling could be better. Turning radius isn't great - which can be challenging when you live in the city (parking, getting in garages from alley, etc.).
That said, this car is REALLY comfortable. The front seats are more comfortable than most people's family room furniture. The passenger compartment is spacious and the styling is pretty nice. Stereo has nice sound, but the turn-knob style used for certain features is frustrating. Trunk is big and back seats fold down, so you can put quite a bit of stuff in this car if you need to. Exterior styling is nice and has been copied by subsequent Volvo models (1999 S80 was the first year/car with Volvo's distinctive back-end and overall redesign).
My plan is to drive this car until it dies (or a really expensive repair comes up) since I have the car paid off. I do like the comfort and it is sufficient for me right now. That said, I wouldn't buy another one... and for that fact, not sure if I would buy another Volvo unless I saw great reviews, and in particular, reliability/repair info on the make/model I was considering.