Engine oil serves two primary functions: lubricating metal parts and dissipating heat. Oil forms a thin barrier between moving components, like pistons and bearings, which reduces friction. It also carries heat away from combustion and friction zones toward the oil pan or oil cooler.

When oil drops below the recommended level, the barrier weakens. Friction increases, heat builds faster, and the engine struggles to maintain safe temperatures. Low oil affects the engine even if the radiator, coolant, and thermostat are functioning correctly.

Low oil triggers a chain reaction that can quickly lead to overheating, such as:

• Increased friction: Without sufficient oil, metal parts rub against each other, generating excessive heat and accelerating wear.
• Poor heat dissipation: With less oil circulating, the engine cannot carry heat away efficiently, forcing the cooling system to work harder.
• Potential engine damage: Persistent high temperatures can cause warping of cylinder heads, pistons, and gaskets, leading to leaks or severe engine failure.

Even short periods of running low on oil can stress the engine, making early detection essential. It’s very important to know when to schedule an oil change.

Many drivers first suspect coolant leaks or radiator problems when the temperature gauge rises. While those issues matter, low oil remains a frequent and overlooked cause of overheating.

Sometimes, engines can run normally for a while with low oil levels. Symptoms appear only when heat overwhelms the cooling system, such as:

• Rising temperature gauge or warning lights
• Knocking or tapping sounds from internal components
• Burning smells or smoke from leaking oil on hot parts

Ignoring these warning signs can turn a minor oil issue into significant engine damage.

Regularly check your oil level, replace old oil, and address leaks immediately. If your Nissan or another vehicle shows signs of overheating, stop driving and have a certified technician inspect it.