Great info Pez. Thanks for the link.
If you're interested in getting oil analysis done you can go to
http://www.928motorsports.com/parts/oilanalysiskit.php and order some kits. It's the best price I've found so far. It's not just for 928s, the analysis company is a general oil analysis that is good for any car.
This is going on my oil change list as soon as the kits get here. :dance: