I pushed a pair of Saab 900 to 200,000 miles, one turbo, one non. I bought them both at 100k on the clock, and always ran them on Mobile1 5w30.
Here is my advice: if it has always been on dino, KEEP it on dino, I don't care what anyone else says. If it only had 100k on the clock, I'd say sure, switch to synth, as you can usually get the front seal replaced for about $100 which is not a big deal. But don't switch with 167k miles, there's no point anymore. That car I'm sure has so many other PITA little problems, it's starting to be a burden.
Both times I switched to synth, it *immediately* the car would start SPEWING oil all over the place, necessitating "front" seal replacement (which is against the firewall, since the 900 motor is spun 180 degrees.
The Saab motor is just one of those that is prone to having crud keeping the oil in, rather than neoprene.
Even though I always changed the synthetic oil at 3,000 miles, and the motors were in pretty good shape to start with, by 200,000 miles, both engines were *very* tired, and the turbo motor had lots of connecting rod bearing noise.
The original 900 was quite amazing in its time. Its time has passed.
If it were my car, I'd just throw a light Castrol dino into it like 10w30 and a non-fram oil filter and forget about it... and I'd be pricing Hondas!
