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Seems like your filter should be picking up flakes big enough to see in the VVT screens. I would think timing chain metal would go straight to the pan and then get filtered before it makes it to the VVT solenoid. Might want to cut open the filter and drop the pan to see what is being collected. Also you could send the oil to be analyzed to see what type of metal is suspended in it. This could give you a clue as to what is failing.
 
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