Oil changes in diesel engines should be performed according to what?

The correct answer is rooted in the importance of following manufacturer’s instructions when it comes to the maintenance of diesel engines, specifically regarding oil changes. Diesel engines are complex machines, and manufacturers design their engines with specific requirements that are essential for optimal performance and longevity.

Following the manufacturer's instructions ensures that the correct type and quality of oil are used, as well as appropriate intervals for changes, which can vary based on engine design and intended application. This is crucial because using the wrong oil or neglecting to change it at the recommended intervals can lead to engine wear, decreased efficiency, and potentially serious mechanical issues.

While personal preference, industry standards, and time intervals can all play a role in maintenance practices, they may not be tailored specifically to the engine's unique needs. Manufacturer guidelines are formulated based on rigorous testing and engineering principles, making them the most reliable source for maintenance instructions.