What factor can lead to premature failure of crankshaft bearings?

Infrequent oil changes can significantly contribute to the premature failure of crankshaft bearings. Engine oil plays a vital role in lubricating moving parts, including the bearings that support the crankshaft. Over time, oil deteriorates due to contamination, oxidation, and breakdown from heat. When oil is not changed frequently, it loses its effectiveness in maintaining proper lubrication and may not provide adequate protection against wear. This can lead to increased friction, overheating, and ultimately, the failure of the bearings.

Furthermore, dirty or degraded oil can contain particulates and contaminants that exacerbate wear on the bearing surfaces. Regular oil changes ensure that the bearings are adequately lubricated and protected, which is crucial for their longevity and proper functioning within the engine.