I have low oil pressure on my 89 LX Sport ragtop, 5.0 5 speed. When I bought it from the original owner at 193,000 miles, he had only driven it about 100 miles a year for the previous 8 years. As I drove it the 3 miles to the house it showed no oil pressure. I pulled the sending unit and it was plugged solid. A quick trip to the parts store and 10 minutes later I had reasonable pressure for an engine with those miles. I wondered what else was plugged up. The car has had synthetic oil since new. When the car warms up the pressure is at about 1/4 of the gauge, at an idle probably about an eighth. It has had no major work on the engine itself, just peripherals, alternators, water pump, cap and wires, and AC compressor, oh, yeah and a new clutch and pressure plate at about 175,000. I replaced the valve cover gaskets when I first got it, and was absolutely amazed at how clean the valve train and the inside of the valve covers were. This is the first engine I have worked on that has only had synthetic oil in it, I am very impressed. I take it up to 5,00 rpm occasionally, and it still feels pretty together. So enough yak, as the oil pump is the original pump, it has to have some wear on it, I'm confident replacing it will raise the oil pressure some, or even just increase the flow, the engine has to have wear on it, my biggest concern is that if I increase the oil flow and or pressure I will then risk leaks at the oil seals, and valve seals. Has anyone out there replaced the oil pump on a high miles performance engine without any leakage?