My mechs have a theory on this. That oil, that get changed every 3 million miles, that is where people should start. The car doesn't realize that you driving it in harsh conditions when you don't warm it up enough. All it monitors is how many gallons of fuel you burned. That's it. No other car has this issue, because no other car asks you to change the oil every 16k miles. I change mine every 6k, or 9 months.

Mine is an 06 4.8is. NYC, garage kept, no cheese.