Oil pump shim

[Rawze]

I see something that has been missed in this discussion. I have seen people pull their pan off and re-install it, causing the o-ring to fail where the pick-up tube meets the oil pump. Sometimes you have to take off this pick-up tube to get the pan off, and sometimes not. Either way, if that o-ring starts leaking, you will get fluctuations in the oil pressure because it is sucking air. I have seen people destroy engines because that o-ring was sucking air and aerating the oil.

-- Just letting you know since no one has mentioned it.