See...I knew you would.
Ok.. Can you get a vid of the noise for us? Maybe that will help. I assume you haven't changed your air filter recently, and we can rule that out. Less restriction would allow for a louder whine.
Meanwhile, don't pay for the oil to be changed unless you are far enough along that you can't stand by the car and squeeze a spray bottle. An allen wrench, $12 (2 bottles of SC oil) and an old sprayer bottle is all you need to change the oil.