Dude, go to whichever place is running a special. You can usually find a place that is doing $30 oil changes. If not, I usually go to Autozone and get the 6 quarts and filter with a coupon for $15 and just get one of my guys to do it after they get back to the office. Usually brakes, filters, tires etc, I get one of my employees to do it. I'm already paying them, and it's way cheaper than a mechanic. If you don't have employees, I'd suggest starting a business so that you can get your oil changed for free.