Unfortunately, that sounds like a piston slap. Meaning an internal engine issue. I would get this addressed ASAP because right now it may only need a piston. If it fails then you will need an engine. It could just be a bearing on the crankshaft but either way we need to get it addressed because if you just let it go, you will need an engine.
The first test you need to do, is drain the oil and look for metal. I imagine you will see quite a bit.
Let me know if you have questions.
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Friday, November 1st, 2019 AT 8:28 PM