Yeah, those oil change guys are always disgruntled.I'm sorry you are having to deal with this. When I worked at a car dealership we used to always send motors, oil pans, and other various damaged parts to various oil changing places. When I couldn't change the oil at home, I sent it to the dealer, that way there is written record of my oil changes. Now that I have a garage and what not I change the oil myself. Living in the city you probably don't have that option, just take it to the dealer. They usually send coupons to the house. I am not saying dealers are angels either, its just the better of the two options.