Which maintenance practice is most important for extending the life of a truck engine?

Regular oil changes are crucial for extending the life of a truck engine because engine oil plays a vital role in lubricating the internal components of the engine. Fresh oil reduces friction between the moving parts, preventing excessive wear and tear. Over time, oil becomes contaminated with dirt, metal particles, and combustion byproducts, which can lead to decreased lubrication effectiveness, increased engine temperatures, and ultimately engine damage or failure.

Maintaining proper oil levels and changing the oil at recommended intervals ensures that the engine operates smoothly and efficiently, thereby promoting longevity. Other maintenance practices, while important for different aspects of vehicle performance and safety, do not have the same direct impact on the internal workings and overall lifespan of the engine. Regular oil changes specifically target the engine's health, making it a fundamental aspect of truck maintenance.