Has anyone had their oil pressure gauge to begin to read lower pressure, as the engine gets more miles on it? Mine reads lower than it used to at 50 to 70 mph cruising speeds. When the engine is cold, the gauge will read higher pressure until it reaches operating temperature. The pressure gauge used to stay right about 2/3 the way over at 1700 or 1800 rpm, now it's just over halfway on the gauge at that speed/RPM. I just wonder if the sending unit is getting worn out and not reading like it used to. It's a 2001 Dodge Dakota with the 3.9 V6, 109,000 miles on it. The engine is in good shape with no oil leaks or abnormal valvetrain noises to indicate something is wrong internally. I always use 10W30 oil. I appreciate any help you can offer.