I WAS running mobile 1 10W30 since i had the car at like 55k miles. And i was always extremely meticulous about changing the oil every 3k miles. I did the oil changes myself so i know they always got done right. Now wether or not mobile 1 is good for the car is a nother story and is debatable as well. Im using castrol syntec 10W30 full synthetic now..my new motor has like maybe 1k miles on it now?