Which of the following can lead to low engine oil pressure?

Low engine oil pressure is often caused by issues that disrupt the oil flow or the ability of the oil to maintain proper pressure within the engine. Worn bearings and oil leaks are significant contributors to low oil pressure. When bearings wear down, they create larger gaps that oil must fill, reducing the pressure. Similarly, oil leaks, whether from gaskets or seals, can decrease the overall volume of oil within the system, leading to inadequate pressure as the oil pump struggles to maintain the required levels.

In contrast, high engine temperature may influence oil viscosity but is not a direct cause of low oil pressure. Excessive fuel consumption is not related to oil pressure; rather, it reflects engine efficiency and combustion. A new engine installation usually results in normal oil pressure if all parts are functioning properly and installed correctly, it may even benefit from higher pressure due to tighter tolerances in new components. Thus, worn bearings or oil leaks are the primary culprits that result in low engine oil pressure.