Oil pressure in a engine plays an important role in making sure that oil reach the areas they need to.
This helps reduce the wear of engine parts.
Normal oil pressure may vary slightly from one vehicle model to another.
When there’s proper pressure, you’ll see the needle on the gauge at about the middle of the scale, and you won’t see the low-pressure warning indicator light come on.
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To properly lubricate, cool, and clean critical components like crankshaft and camshaft bearings, pistons, and other moving parts, there should be adequate oil flow and pressure in the lubrication system. Together, flow and pressure allow lubrication of components under the valve cover at the top of the engine as well.
To do this, the oil pump has to push oil through narrow clearances under bearings and galleries. It is these narrow passages that build pressure in the system because they restrict the rate of oil flow. The faster the engine moves, the higher the rate of oil flow and the higher the pressure.
Too much pressure can be damaging to engine components, though. A relief valve close to the oil pump opens when the pressure reaches a predetermined value, usually between 45 and 75 psi, allowing extra oil to drain back into the oil pan.
However, when the lubrication system can’t maintain proper oil flow, or pressure drops when it should not, engine components are going to be starved of much-needed oil.
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