I have a 2001 Saab 95 4 cylinder auto w/90k miles on it. My wife compaint that it was making a noise so I took it for a ride. It runs okmbut you can hear noise coming from the engine. I thought Ider or something but that seems good. It sound like from under the valve cover something like gears meshing but could be normal. Anyway it sat in the garage for a day and when I started it up, Smoke came from the excaust almost like the turbo went, ( which I thought) but today when I started it it didn't smoke and ran normal but still have that noise. I do have a question, if I take off the oil cap iy seems to have a smoke or mist about it. I do not know if that is normal. I had this car for 5 years with no problem and can the oil at around 4 k miles with sythetic oil. I do not know if it had the oil pressure mod gone to it.. What do you think?