Why would anyone who turns wenches on their own car let that car out of their sight to allow a stranger to work on it? It's not just an oil change. It's an opportunity for an owner, while under the vehicle, to do a cursory visual check of everything under the front end. ie. tie rods, ball joints, any possible leakage from other areas of the engine and transmission. Also, examination of the old oil for differences from past oil changes... burnt odor, metal shavings, etc. I stop by and get filters and oil on my way home from wherever, you know, like combining trips. Plus you know the job is done right. You can only go by their word of what product they used anyway. And did you know that the oil filter is the weak link in causing engine damage? I always used the "Ultra" version of filters. Yes they are more expensive, but so is replacing an engine. Spend $2 on an oil filter, and get an oil filter in name only. And.... if you are paying $20 for an oil change you are getting crap for oil and a crap filter. There is a profit margin in those oil changes people. Do it yourself and know it is getting done right.