I always go to Domark for my oil changes. They charge around $30 but it is well worth it because a car wash is covered in that price. The workers do a fantastic job of cleaning the car inside and out when it comes out of the automated car wash. Make sure to tip them a couple of bucks for their effort. Domark is very nice from the inside as you can watch the whole car wash process through the clear glass windows while grabbing some refreshments. If it is raining on the day you get your oil change, they will give you a rain check and you can come back anytime for the wash. You can get just the wash itself for around $10 if you like.
more