it could be a sign of a clogged pickup tube. The pump is mechanical, so its really not as prone to failure. If the tube is clogged, then you'll have the low pressure and the lack of oil to the valvetrain.
mine has 80k on the clock, 4 bar of oil pressure (spec is 3.5-4.5 Bar), a new pickup tube and a new cam adjuster and STILL has noise. Guess my next step is to start swapping out the lifters and changing the cam chain. I have cars with 130k on the clock that have some sludge and are still super quiet. Makes me CRAZY
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