Is this a sound that you get when you start your car cold that goes away? or does it continue even after car warms up?

Mine is noisier when I start it cold but it goes away when it warms up. If I start it and let it idle I'd say it goes away in 10 minutes at idle speed.

Once it is warmed up I'd say that is half as noisey. I thought this was normal.

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1982 300SD