Every comment that has been made is accurate. Some OEM gauges can be off, and others are not. However, since the light is coming on, we recommend that you check the oil pressure with a mechanical gauge. Most parts stores will lend them to you. All you do is remove the original sending unit and then screw in the adapter for the oil gauge. When you start the engine, it will read an accurate pressure. If it showing good pressure at an idle, then you should replace the sending unit. They go bad often. If the pressure is still showing very low, you should consider removing the oil pan to check that the oil pick-up tube isn't partially plugged. IF it isn't, then the pump itself will need inspected.
In general, if the oil pressure is extremely low, usually you will start to hear a knocking or ticking from the engine. If it is okay and the sensor is bad, you won't hear anything. However, it is better to be safe than sorry. Someone posted a pic of an oil pressure gauge. They are very easy to use, and from what I can see, you will have about 5 or 6 techs waiting to help you if you have any problems or questions.
Let us know what you find.
Monday, December 12th, 2011 AT 1:03 AM