I had an 86 Saab 900 turbo til 2015, when it got too expensive for me to fix (after the temp gage randomly failed, in Saab-hated heavy trafffic, without my knowledge til smoke started coming out the hood), and I exclusively took it to Petersen Auto in Skokie, who specialize in Saab. The guy running the shop wasn't the most pleasant (I often felt condescended to, especially after trying to vocally replicate the sound the vehicle had been making but of course wasn't now that I was at the mechanic) but they knew what they were doing with Saab and did it very well. If I had had the money to throw at that car, I would have had them fix it and kept driving it.