Today was the first day I had to scrape my windshield, and since this is North Dakota, it won't be the last. It was approximately 25 to 30 degrees this morning and I noticed a high-pitched whine coming from my engine at more than 2500RPMs. It sounded just like a turbo, but last time I checked I didn't have one under there...

It's a whistling sound, and rises quite dramatically at above 3,500RPM.