I recently had to replace the plenum because it warped and sucked antifreeze in. Once I got this done,(replaced the plenum and lower intake gaskets) I drove the car for about 50 miles and had no issues. The next morning I was going to change oil and when I started the car, I noticed the oil pressure gauge was reading 0. After some research and talking to people, I pulled the oil pan and found the oil pickup tube clogged with a fiberous material, once oil was squeezed out, it look whitish in color. I cleaned this all out of the screen and reinstalled the tube, a new pan gasket and the pan. I started the car and drove it and had 40 PSI all the while. This morning I started the car and the oil gauge hesitated for a moment but then came up to around 35 PSI or a little higher. I start my way to work and did not go to far when the gauge fluctulated to 0 and then back to 25. I immediatly stopped the car and restarted and had about 25 PSI and it seemed to hold. I started out again and the same thing happened. Car is now parked along road awaiting tow. I was not able to hear the knock but I think I hear the lifters rattle a bit... pretty much the same sound I had in my garage when this first started. I know I did not leave anything in the engine when I replaced the plenum and intake gaskets so I am not sure what the fiber material is or how long it has been in the engine.
Oil pressure issue on 1995 Buick Park Avenue
Sometimes inexpensive oil filters will collapse and the filter material will be pushed out into the oil passages, A lot of the drive thru oil changers have a filter washing machine, The machine is supposed to clean the debris from the filter (That can't be good )and they repaint them. I always use Napa Gold filters because an engine is too expensive to trust a cheap filter, Pull the pan clean off the screen and change filter and oil and hopefully you didn't damage the bearings.