Hi guys. I just bought a 99 T/A A4. It has 140k miles on the odometer. The body and interior are in fantastic shape for the age and miles and is all original. At start up she sounds real nice and not a hint of smoke. The oil pressure gauge needle is right in the middle or just to the right of the midway mark. After I idle it for around 10 minutes or so it starts to make a clicking sound in the motor and the oil pressure starts to drop slowly. Im almost sure its the lifters making the noise. As the oil pressure goes into the red the noise turns to a rattle noise and if I tap on the throttle it gets a little louder so I shut it off. Oil level is good and I just had the oil changed. If I go back about ten or so minutes later it does the same thing, starts off idling quietly then gets noisy after a while. Ive read about oil pressure problems in these cars so I want to go and have an SLP oil pump and timing chain installed. A Camaro expert in town tells met to just replace the engine but I dont want to spend a few grand on a motor if I can try and save this one. What do you think will happen if I go ahead with replacing the oil pump and chain? How much is the labor on a job like that? This car is not a daily driver. I have it stored away in another town and only expect to drive it on weekends maybe a few times a year. I just would like to get a few more thousand miles out of this engine if I could.