question regarding where the oil filter cartridge slides onto. When I unscrewed the plastic housing and pulled off the old filter I had a metal piece with a spring, come off with the cartridge. I have no idea why it came off with the old filter but when I reinstalled everything I was getting a low oil pressure warning. I went back and removed that 'extra' piece and oil pressure was back to normal. I am baffled and last oil change was over a year ago and do not remember that piece being an issue.
