I only have 9000 miles and the car is hesitating a tiny bit. So I decided to look at the Air Filter. Well, it had some oil covering most of the filter. It seemed somewhat restrictive to me.
I did a search and found most people said it was normal. My question is how much is normal if it's even supposed to be there. And, if it's normal, are we supposed to replace our air filters every 10,000 miles?