hello i dirive a cadillac catera 1998 engine v-6 2962 3.0l dohc. Sometime when i am driving my oil pressure wil go liw, but my light will not turn on this started when i took my car to jiffy lube and got an oil change and used high millage oil. before that when i drove it was not going all the way down but when i hit the gas or brake the gage will go up and down i never got that checked because i thought that was okay i guess my first question is that normal? i took the car to a local dealer who and on the writee up paper it says " performed oil pressure test with engine hooked up and moniterd upon check out with oil pressure gauge hooked up found that the warmer the vechicle got the lower the oil pressure was for tengine close to min SPECS. advised customer possible to try lucus engine treatment additive during next oil change even 10w 40 but it is a internal issue with engine possible oil pump is failing internal engine bearing" what does this mean currently iam still paying for this car and need it for work pubblic transportion is limited where i live please help.