Manufacturers/Dealers take the lowest bidder when it comes to oil. Usually, it is Castrol or Quaker State. They get the oil for pennies on the quart and charge you retail + for it. The better ones will match the weight of the oil to whatever is recommended, if it is available. If not, they get as close as they can....and you have the proof. They would not make near as much $$$ by using the recommended Mobil One.

Just one more reason to do it yourself.....in my opinion. Then you have no doubt the correct oil was used, the o-rings are in the proper position, and the satisfaction knowing that your car has been serviced correctly. It's so easy, anyone could do it!!!