I'm just curious as to why they arrived at this figure? Wouldn't it be much easier for it to be 5000 miles since it's easier to do according to your odometer? Up here in Canada, the most popular interval (by dealers and lube shops!) is also 3000 miles, but mainly because that works out to 5000 kilometers. So this also makes it easier for people to remember when to do it, since they can do it on the 5s. But it seems that doing it every 3k like a lot of people in the US do, makes it harder to remember. Even more puzzling is the 7500 mile interval. Why would they not have just rounded that off to 7k or 8k? I guess there is no real answer to my questions, I'm just pondering.