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UPDATE: I think we figured it out. I had a mechanic friend of mine come over and we went for a ride so he could hear it. Then when we got back he said to spray some WD-40 on the shaft of the alternator. I did this and.... noise gone! We went driving some more at high speed and we noticed that...

@NDT I don't know if that's it. How would I confirm that? From what I read, that valve makes a "hissing" noise. This is not the sound I'm hearing. More like a constant tone, high pitched squeal that seems worse when the engine is warm and I'm cruising at 40+mph. Also what exactly is the...

Sortof! But that sounds similar to a belt whine. Mine is different, so unlikely to be ants, or a belt. It's more of a constant high pitched "eeeee" sound like this:

that's a good idea. I just need a victim... er I mean "helper". But I think one will be available tomorrow. I doubt it's the power steering pump because the noise doesn't seem to change when I turn the wheel as I would expect it to. But yeah, I'm open to any ideas at this point. The sound is...

Hmmm.... I like the way you think. I guess I'll take the belts off and see if it turns freely by hand, or if it screams "eeee" at me.

Hi I'm new to the forum. I bought an M998 about a month and a half ago from someone else who owned it for a few years and took good care of it. I drive it almost every day and just in the last couple of days it has started making a high pitch "eeeeeeeeeeeee" noise which seems related to engine...