Engine light started flashing, would not accelerate much. Oil came out of cap.

What is your question?

So I was driving my Saab about a week back and had to accelerate a little quickly to merge onto a highway. The car did fine up until it reached 5k rpms. At this point it froze at 5k for a little while before violently shuddering and shifting up. Right after it shifted, the check engine light came on and started flashing. Eventually the light turned off and it drove fine for the rest of the trip. The only noticeable problem was what felt and looked like a misfire whenever the car was idling. The next day, under somewhat less acceleration, the car badly shuttered and the engine light began flashing again. This time, the car would barely accelerate anywhere and felt like it was rapidly misfiring all of the time. I barely nursed it back to my house because it refused to go much faster than 20 mph and would take 30+ sec to get there. When I checked under the hood, oil had been sprayed directly out of the oil filler cap. At this point, I was afraid to even try to start the car so I had it towed to a mechanic nearby. What they told me was that both the engine and the turbo were destroyed. They said that oil had been pushed into the induction system, causing the engine to misfire. Also, the leaking oil caused low oil pressure, which somehow led to high crankcase pressure, which basically ruined all of the piston rings and other small parts of the engine. I just want to make sure that they're not, in fact, ripping me off and that the engine and turbo are basically totaled.