So while I took off my valve cover at 111k to change its leaking gasket I took some photos. There are some oil garnish but no sludge. Is the yellowing of the camshafts a bad sign or is it normal?

Celerio 2010, I change oil every 10k/1yr with full synthetic oil. Current oil is 0w20 mobil 1 advanced fuel economy dexos1 gen2.

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