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Thanks for all of the insight and guidance, everyone! I'm learning a lot here! It's extremely valuable to learn about the manufacturing materials and recommended oil flushing techniques. In response to further inquiries: The engine was replaced via Mazda warranty with a new engine at 80,000...

2005 Mazda Rx8 Rotary Valvoline Conventional High Milage 5W20 Sorry for the lack of baseline data, but I hadn't heard of oil analysis until a couple of months ago. I've had my RX8 for 7 years now, have tried to keep it well maintained, and have had very few issues with it. Now, at 137,000 miles...