Supposedly, they send you an entire test kit and everything so that you send them everything they need for the analysis. A few people on one of the other forums I go to have had this done. I should probably get it done on my corrado since I don't drive it a lot, but track time can certainly put a dent in the properties of your oil, especially with aftermarket forced induction/tuning.

There are also other oil analysis companies out there, but blackstone is the one that I hear about most frequently. I personally have never used them, so you might want to search around the internet to make sure their customers are as happy as they seem. I can say I have never heard a complaint though.