I don't change my oil, but I like to have synthetic oil in my car. My KIA dealer doesn't have synthetic so I have wal-mart change my oil, but I buy the filter from KIA. The filter Wal Mart has listed for the Amanti cost a little under $6 and the factory filter from the dealer cost me $6.38. I hand them my filter and watch them put it on my car. You have to watch them carefully. Not just drop the car off and leave. When they are done with my car I check a couple of things. Like do I see oil any where on the bottom of my car. Take a towel for that because you have to crawl on the ground to see the underside of your car. I also check the oil. I don't want to turn a corner and have my low oil pressure light to come on. I also mark the filter before I hand it to them with the date and mileage, so if I am ever questioned about an oil change I have the reciept for the oil filter and a reciept for the oil change, and the filter is marked. I don't distrust Wal Mart, but I don't trust them either. I also never want to be in a position where I need an engine, and the dealer tells me they won't cover it because they say I didn't keep up with my service. I think you have to be a little more carefull when you take a vehicle to somewhere other than the dealer. I hope this is helpfull!