Don't feel bad, one time I took my truck to the dealership for some stuff, and an oil change. I had the oil and filter in a box in the open bed of the truck, and I told them to use the oil I provided. When I went back to get it, the oil that I bought, and the filter were still in the box in my truck bed. I thought about asking them why, etc., but decided to just forget it, and go on. I am pretty sure I had mobil 1 and a wix in the box, but that is not what went on and in the truck. I figured it isn't worth getting into it with them, so, I didn't.