How frequently is the oil changed on the BPU when using 15W-40 motor oil?

Changing oil at the correct intervals is crucial for maintaining optimal engine performance and longevity. In the context of using 15W-40 motor oil, the recommended interval is every 400 hours. This frequency ensures that the oil retains its properties and effectively lubricates the engine components, which helps prevent wear and tear.

Choosing to change the oil every 400 hours means that the oil is being replaced at an interval that balances performance and protection, considering the typical stresses and operating conditions of the BPU. This distance also reflects the oil's ability to sustain its viscosity and protect the engine under various operating temperatures and loads. Regular oil changes at this interval help maintain engine cleanliness by reducing the buildup of contaminants and sludge that can affect engine performance over time.