Valet service? Do they arrive with a car on a truck, or drive one to you, and drive your car back to dealer? Lol... Because there's no chance I'm going to let some hack rev out my car on a Ferris Bueller joy ride! Hahaha...
And really, worried about warranty denial because you changed your own oil? Hahaha... Unless they could prove you didn't put oil back in, regardless of the oil used, unless kitchen oil, they'd have a hard time proving your oil somehow or another caused catastrophic failure! Keep receipts, records, log book, etc.
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