Low oil pressure
Low oil pressure can manifest itself in a number of ways. If the vehicle is equipped with an oil pressure gauge, the most obvious sign of low pressure will be a low reading on the gauge. But before you suspect wear on a large number of metal engine parts, do some checking.
Make sure the oil pressure warning light is working properly. Make sure the problem is really low oil pressure by removing the oil pressure sensor and installing an oil pressure gauge in the hole for it. If you do not have such a gauge, you can rent one from a workshop.
The oil pressure value you should expect will vary with the oil temperature. The oil temperature will vary with the engine temperature. It may be that when you perform this check the engine will be cold. Cold oil by definition gives higher pressure than warm oil. This will be true even when using multigrade oils.
When a mechanical oil pressure gauge is connected to the hole where the oil pressure sensor was installed, start the engine immediately after starting the engine and before actually checking the oil pressure, check the connection of the pressure gauge and make sure there are no oil leaks. Even small leaks on some pressure gauges can cause an error in the readings of the instrument. If no leaks are found, then compare the oil pressure with the values specified in the technical data of the engine.
This oil pan shows the results of too infrequent engine oil changes. The layer of deposits on the bottom of the pan is 1-1.5 cm thick.
