Look at it this way, those parts all lasted 100k miles to begin with... change them now and you should get about the same from them.

Also, when you hear the squealing under the hood try pulling off the oil fill cap. If there is some slight vacuum there it is normal, but if it has full intake vacuum and the cap is hard to remove because of that, the rubber diaphragm in the rear cover plate of the intake manifold is busted putting full intake vacuum through the crankcase through the CCV system, and that usually causes the front and rear main seals to have air sucked through them causing a squeal and oil to be sucked into the manifold.

Sounds like that may be your problem in this case.

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