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I had my Boss in for service at my dealer for a whine at 65-80MPH. They replaced the rear axle gear and pinion assembly which has helped a little. They also said I had a free oil change in their system and I was ready for one anyways. The service advisor told me it was good for whatever the car calls for and in this case 5w-50 full synthetic. They've done it before so I think no problem.
Go to pick the car up and the paperwork wasn't ready. They said they'd just mail it so I'm fine with that and leave. Get the paperwork a week later and find out they put 8 quarts of 5-W20 in it. I've put about 500 miles on since then. Has this possibly damaged my engine? How do I go about making sure? What should I expect out of the dealer other than draining the oil and putting the correct oil in?
Go to pick the car up and the paperwork wasn't ready. They said they'd just mail it so I'm fine with that and leave. Get the paperwork a week later and find out they put 8 quarts of 5-W20 in it. I've put about 500 miles on since then. Has this possibly damaged my engine? How do I go about making sure? What should I expect out of the dealer other than draining the oil and putting the correct oil in?