Agree it is probably from a broken timing chain guide. How critical is it? VERY much so, as in don't drive it. The oil intake is being restricted and the timing chain may break or be hitting something/ damaging another component and shredding material into the oil.

The engine should come out, the oil pan off and the front cover removed, unfortunately this is a TON of work. Inspect a couple of bearings for oil starvation, look at the ones farthest from the oil pump first. Thoroughly clean and examine the oil pump intake for blockage and open the oil pump to look at it internally.

Good luck!!!

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