I have a unit that will operate with no hesitation and no loss of power or obnoxious noises in the block. Yet the oil pressure warning will light on the dash and shut it down within a few minutes of operation. Unit will start right back up and operate flawlessly until shut down again within a few minutes. Customer initially perceived it as a overheating situation but was incorrect. I confirmed by taking temps from thermostat housing and radiator at the point of shut down with 185 degrees recorder at thermostat ( normal ). However I have a block temp of 300 degrees directly behind the exhaust manifold , could the heat be thinning the oil as much to cause a pressure drop ? Or is it just common for these oil senders to fail ?