What Causes Excessive Engine Oil Temperature in BMW 5 Series?
2 Answers
If the engine oil temperature becomes too high, you can replace the engine oil cooler, as the excessive temperature may be caused by poor performance of the oil cooler. When the engine oil temperature is too high, it must be repaired immediately; otherwise, it will affect the normal operation of the engine. More information about engine oil is as follows: 1. Introduction: Engine oil is referred to as the lifeblood of the engine. Without engine oil, the engine cannot function properly. During engine operation, the oil forms a thin film on the surfaces of various engine components, preventing excessive friction and heat generation. 2. Replacement: Regularly change the engine oil during vehicle use. Each time the engine oil is replaced, the oil filter should also be replaced. The oil filter is responsible for filtering the engine oil. Without this component, the oil would become dirty over time, which could impair the engine's normal operation.
I've encountered the issue of high engine oil temperature in the BMW 5 Series several times, which is quite annoying. Common causes include cooling system failures, such as a malfunctioning radiator fan that doesn't spin or spins too slowly, or insufficient coolant due to leaks, which can't effectively cool the oil. The oil itself is also a critical factor—if the oil level is low, too dirty and degraded, or the oil filter is clogged, poor circulation leads to rapid heating. Additionally, excessive engine load, like climbing long hills with the air conditioning at full blast, increases the engine's workload and naturally raises the temperature. Sometimes, sensors may give false alarms, but most of the time, it's a real issue. Once during a summer highway drive, I noticed the temperature gauge skyrocketing—turned out the fan motor was stuck. I fixed it immediately to avoid engine damage. I recommend fellow drivers to regularly check coolant levels, clean radiator fins of dust, and change to high-quality oil on time to prevent such problems.
