What is NOT commonly a cause of low engine oil pressure?

An engine's oil pressure is crucial for ensuring proper lubrication and operation of its components, and certain factors can lead to low oil pressure. When considering why using oil that is too heavy of a grade is not commonly a cause of low engine oil pressure, it's important to note that heavier oils typically do not create low pressure; in fact, they can sometimes result in higher pressure as they resist flow more than lighter oils do.

In contrast, oil contamination can lead to low pressure as it can hinder proper lubrication and fluid flow. A clogged oil filter can restrict the flow of oil, leading to low pressure readings. Worn engine components may also create larger clearances between moving parts, allowing oil to escape more easily and resulting in decreased pressure. Heavy oil may slow down engine operation and potentially cause issues with circulation, but it is less likely to inherently cause a drop in pressure compared to the other factors.