Whoa just saw this. The v-6 is not a sludger. It's tough on timing belts but otherwise soild. That being said, I think the general prescriptions to use synth still should apply with this engine. Yes, I'd also use a 40 weight like Rotella T Synth 5W40, M1 0W40, Amsoil 5W40 Euro etc...
Depending on where the car is located, I'd take it to a SAAB mechanic who'll know the "sounds of failure" of this engine.... But I'd bet the constant use of dino has coked the turbo bearings and caused failure....
These are good, solid engines that should last many miles IF properly cared for....
