What is Low Oil Pressure?

When your car engine is running normally, that is, it has warmed up and there are no mechanical issues then its oil pressure should be approximately 10 pounds per square inch for every 1000 revolutions per minute, typically 40 PSI. This is the pressure needed to make sure that the oil can perform its core duties of lubricating and cooling. Low oil pressure occurs when the oil pressure gauge (based on readings sent from the oil pressure gauge sender) measures values outside of these guidelines. This has repercussions for the engine in terms of overheating and, more seriously, reduced lubrication effectiveness potentially leading to permanent damage. It is not only low oil pressure that can be problematic but high pressure can be too, placing extra stress on the engine. High pressure is often relieved by a valve that redirects oil back to the sum once the preset level is obtained.

One of the biggest causes of low oil pressure is not having enough oil. Luckily this is easy to fix by topping up the levels. Checking the oil level should be a part of your regular car maintenance routine. Another cause of low pressure is the almost imperceptible changes to the dimensions of the engine caused by wear and tear over time, or caused by particles within the oil having a "scrubbing" effect on the metal. Even minute changes in size can cause large pressure changes. Oil is filtered to remove as much detritus as possible but holes used to filter can only be made so small before they hinder the flow of oil.

Low oil pressure is such a serious problem that if your car is suffering from it you should take immediate action. Don't ignore the warning thinking it will go away. Once the engine has cooled check your oil levels. If they are satisfactory seek professional help to ascertain the real cause of the low oil pressure problem.