Can anyone verify the maintenance intervals for the ST? My dealer is trying to convince me that the ST oil change mileage interval is 7,500 mi., while the standard model is 10,000 mi. I can't find anything that specifies this. The ST supplement does specify that a minimum of semi-synthetic oil be used, while the standard model is allowed to use non-synthetic. But the mileage interval seems to be unchanged. I won't argue that a shorter interval might be beneficial, but I want to know what the factory requirements are. I suspect that the dealer is just trying to generate more revenue, which doesn't matter anyhow because I do my own maintenance.