2007 Audi A8 4.2, with 143K, got the low oil pressure warning after going above 2000rpm. This car has been problem free for years and I do all my own maintenance, just did an oil change 2000 miles ago. Decided to pull the oil filter out and this car has a cartridge type filter. The small nipple on the bottom of the filter broke off and I cannot locate it in the oil filter housing. It is a small piece of plastic, would this cause my low oil pressure?