What's weird is the filter that I took off w/ this change DID have a decent amount of gunk in it. Also, worth considering...I was coming off a rinse phase using 5W30 Supertech. Perhaps what was left in the sump affected the viscosity readings. I've spoken to some other saab folks who've used this oilmedic test and they DID say all their viscosities were on the low side, so perhaps this is a consistant low reading of viscosity? As for spirited driving, I am 29 but drive like I'm about 89. With everything I've read about this car's engine, I'm afraid to really nail it!
No, I haven't been using synth. I suspect the orig. owner didn't either. The only synth I've used was M1 EP 5W30 on my first arx clean phase. After that, since I figured I'd be doing short intervals, I've been using dino until my last change, when I threw in Pennzoil Plat 5W30.
To further complicate things, it may not be a clear case of bottom end bearing wear. Someone pointed out the fact that there are some leaded bushings in the upper valve train!
One thing one person pointed out was so far, there doesn't seem to be a whole lot of difference in numbers between synth blends, full synths, synth HDEOs and dino HDEOs.