if it's mobil 1 saying you don't need to do oil change every 3k miles, would you follow it?

they have extended performance oil on 5w30, 10w30...etc, labeled oil change period: 15000 miles.

http://www.mobil1.com/USA-English/Mo...rformance.aspx

is that the fact that you just trust mobil more than any other brands tha you don't see much in parts stores?

or

is it becuz you think it must be right to do oil change frequently?

or

is it becuz mobil didn't have such extended performance oil in the market so you believe less frequent oil change will hurt your motor even there were already some advance developed motor oil available in the market that were proven to protect your motor longer and better?