What might occur if engine oil is not changed regularly?

Regular oil changes are crucial for maintaining an engine's health and performance. Engine oil serves several vital functions, including lubrication of moving parts, cooling the engine, and carrying away contaminants. Over time, oil can become contaminated with dirt, debris, and breakdown products from engine operation, leading to a decrease in its effectiveness.

When oil is not changed regularly, it can lose its viscosity and ability to properly lubricate engine components. This can result in increased friction among moving parts, leading to accelerated wear and tear. As components wear down, they are more susceptible to damage, which can eventually lead to catastrophic engine failure. This not only affects the performance of the engine but can also result in costly repairs or even necessitate a complete engine replacement.

In contrast, options involving improved fuel efficiency, increased horsepower, and better engine responsiveness are typically associated with well-maintained engines and regular oil changes rather than the consequences of neglecting this maintenance task.