Nice, not that 100,000 is a ton of miles for a Mazda. Changing synthetic oil at 3K miles is a lot of wasted oil and time.
Oil... i was wondering on the whole oil change frequency thing. I live in Vancouver, Canada, so very mild temperatures. Rarely snows, mostly rain in the winter, pretty much like Seattle. In fact, the US border is just 20 minutes away. Anyway, because this is a Canadian car, it is recommended on the 'harsh environment' oil change schedule. ..