Rattle on cold start

When I turn the car on after it’s been sitting for a couple of hours or in the morning. I recently started getting this loud obnoxious rattle that goes away after it warms up. Coming from the engine. Help please ?? Anybody know what it could be ?

https://youtu.be/ZXmBBEPdJ3g



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Have you checked your oil lately? If it's low and draining out of the head, it might make noise until it gets back up into the head again, which could take significantly longer if there is less oil available.