Oil threads, got to love them, LOLWhy go that long? 7500 is my absolute max and I drive 95 percent highway.
I'll give you a couple of reasons. I grant you there are some pros on this board who can perhaps go 10,000 miles on an oil change but they are experts and have a very clear understanding of what that entails. They must do the groundwork in preparing for a long oil change interval by having at least one oil analysis performed and preferably two. They must also know that if their driving habits or environmental conditions change during the course of that long oil change interval, they must reevaluate whether they should change their oil earlier than 10k. (dusty conditions, etc.)If a high quality synthetic oil is used, why not?