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I am not sure how much of the horizontal portion of the oil pickup tube is submerged in oil while running.
My reasoning was if that o-ring's material is as bad as the oil pan gasket, valve cover gasket, oil filter housing gasket and valvetronic "football" gasket, then spending all those hours taking off and putting back the oil pan would be a good time to replace that.
If that o-ring hardened and shrank with age and heat, I would think some air would get sucked past it.
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