Something came up on the Saab forums a week or two ago about this guy using different oils and seems have to found a good oil for the Saabs to use to prevent Sludge (this is a problem with the Saabs). The before and after shots are remarkable in my book and have come to wonder if it would have the same effect on our motors, our motors are pretty stout and I've always run a 0w-30 mobil 1 oil in my Prix but this might something to consider.
Engine Flush Results ****Photos**** - SaabCentral Forums
The oil is on Amazon for $54+shipping for 6 quarts, I think I will give this stuff a try next oil change in the prix