Wow estrackel, some pretty premature failures. I too have a 2008 9-5, now with 98,000 miles...bought at 61,450. The original owner took it in for all services. He only changed the rear brake pads in that time, plus transmission fluid every 10,000 miles and oil changes at 3,000 miles.
When I was shopping for my 9-5, I didn't want the Xenon option. Dealt with that hassle and expense on a previous Cadillac DTS. I wanted the bulb and ballast nightmare far in my rearview mirror.
I've been through 2 sets of OEM wiper blades in 37,000 miles
Still on my new DIC and NGK plugs from when I bought the 9-5 37,000 miles ago.
Still going strong on the original foglight bulbs I think. Not sure if the original owner ever changed them.
Have changed my Halogen headlight bulbs twice in 37,000 miles.
Still on the original A/C refrigerant.
Replaced heater bypass valve after I bought the car. Am considering the heater bypass valve delete. So far, so good.
Replaced all hoses and belts when I bought the car...preventative.
Of course the shifter jalousie needed to be replaced at 90,000 miles.
Replaced the coolant sensor and thermostat after I bought the car.
Yep, replaced the throttle body at 82,000 miles or so. Tried cleaning it but that worked for about 3 weeks.
Replaced o2 sensor and PVC valve when purchased. My in-town mileage was bad so replaced them. It's still not good, but better than it was.
Of course my turn signal stalk is loose, like all 9-5's. No failure yet.
After the tree fell in front of my car, I had to replace the headlights, bumper, grilles, hood, passenger front fender, and other parts. Most were purchased in quantity from one excellent salvage yard for $900 total. A few parts bought new. I elected to buy a new bumper from Orio without the headlight washers. Saved me a lot of money on the washers and mechanism. Besides, they were pretty wonky to begin with. Except for mine, I've never seen an 06-09 9-5 without the headlight washers.
Replaced the battery when purchased. It failed at 85,000 miles and Exide replaced it for no charge under warranty.
Have yet to replace the window rollers. No idea why at 98,000 miles. Watch, one will fail tomorrow...hah!