I agree with the others, go back and demand they put Mobil 1 back in, install a new filter etc.
Sometime ago, 1998 to be exact I brought my 1998 Monte Carlo into the Chevy for an oil change to synthetic oil, new car with 2500 miles. I had my own oil and filter but the service writer assured my that was no problem. She wrote right on the work order, "Use customer supplied oil and filter". I came back later to pickup the car, told them to bill me and went out to get into car and saw my oil was still on the front floor. Asked the service person what was going on, she was baffled so she called over the tech and I asked him what he put in my car and why not my oil. He goes on to say, that synthetic oil in no good for you car and he put in Marathon brand oil instead because thats what they recommend. I proceeded to explain to him that it was my car and that I was paying them to do what I wanted, not what he wanted. As I was talking about this, my salesman/owner was passing by and listening, He asked me what was the problem. I explained it to him and then told him this man (was a jerk) just cost you a 30 yr customer. I decided it was time to leave and walked outside to my car. I was sitting in the car reading the invoice when the tech comes walking over to talk, I rolled down the window and he proceeds to give me hell for getting him in trouble with the boss. He says a few choices words and tells me F.O. I was so pissed, I traded that Chevy away 3 months later and bought a 1999 GMC. The salesman/owner never once offered to make it right nor did he even make a follow up call and I bought some 10 cars/trucks from them from 1970-1998. Someone told me the *** chewing he gave the tech was for my benefit and then proceeded to bad mouth me when I left. Little did he know a person nearby was a friend and told me this a few days later.
