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In the past how ofter/frequently has the oil and filter been changed? Every 3000 miles? 5000 miles? Whenever you happen to get around to it/remember? Is there any knocking or abnormal noises coming from the motor?
Low oil pressure is usually one of a few things. Crankshaft bearings (which will usually make the engine knock), engine sludge, or the oil pump has failed. Determining the root cause of this condition usually means you're gonna have to start taking stuff apart. You can take off the valve cover and look inside for any signs of sludge. It looks almost like tar inside the motor, in the corners and galleys. IF it is up in the head, you know it will be down in the pan where the oil pump, pickup/etc are all located. It may be new engine time... You may want to take it somewhere (I would recommend the dealer) and have a proper diagnosis of the problem, as this one can get very messy and very deep fast! If you're not ready to start taking your motor apart, then I'd have it towed to someone who is. Good luck!
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First thing you should do is remove the oil pan and inspect the pick up tube. It may be clogged with sludge. Hopefully thats the case as the pan is not hard to get off. To get the pan off you need to remove the Y-Pipe then the pan just unbolts. If the pickup is good and no sludge, it could get complicated as the oil pump is behind the timing chains. I have one of these engines myself and know it very well. I'm betting its the tube being clogged.