
BMW 525 requires 6.5 liters of oil. The following are precautions when changing the oil: 1. Drain the oil when it is hot. At this time, the fluidity is better, and it can flow out of the oil hole more easily, but be careful not to overheat to avoid scalding. 2. Fill to the mark. The amount of oil added should be strictly controlled between the lower and upper marks on the oil dipstick. 3. The oil change cycle should be selected based on the vehicle condition, road conditions, oil quality, and driving habits. 4. The oil should be selected according to the driving environment, driving frequency, and the requirements of the vehicle engine itself. It is better to choose a higher grade than a lower one. 5. Winter and summer oils cannot be substituted for each other. Oil must be changed when the season changes. Diesel and gasoline oils cannot be mixed and should be strictly distinguished. 6. Use of additives. Common oil additives mainly include antioxidants, anti-wear agents, detergents, dispersants, foam inhibitors, anti-corrosion and rust inhibitors, etc. In fact, finished oils already contain these components in a certain proportion. Unless you are a professional, try not to arbitrarily change the oil ratio to avoid unpredictable consequences or losses.

I've been driving a BMW 525 for three years and have always used about 6.5 liters of oil for each oil change. I do the maintenance myself and have chosen Castrol 5W-30 fully synthetic oil, which makes the engine run exceptionally quiet and smooth. The oil change interval is roughly every 8,000 kilometers, but in cities with heavy traffic, I recommend checking the oil level every 5,000 kilometers to avoid wear caused by low oil levels. Regularly checking the dipstick is crucial—I always take a quick look before refueling to ensure the oil level stays at the midpoint mark. In fact, using high-quality oil can also save you some money on fuel and reduce carbon buildup issues.

If you change the oil yourself, the standard amount for a BMW 525 is 6.5 liters. I prefer using Mobil's 5W-40 full synthetic oil, which is reasonably priced and provides good engine protection. I set the oil change frequency at once a year or every 7,000 kilometers, and during the hot summer months, I check the oil level more frequently to avoid low oil issues. Also, don’t forget to check the condition of the oil filter—older filters can cause the oil to get dirty faster, affecting efficiency. After regular use, check the dipstick when the engine is warm; this simple step can help prevent major repairs.

The BMW 525 generally requires about 6.5 liters of engine oil. It's recommended to use the appropriate synthetic oil type, such as 0W-40. Oil changes should be done every 5,000 to 10,000 kilometers, depending on your driving conditions. Too little oil can lead to faster engine wear, so regularly check the dipstick to maintain a safe oil level. Simple maintenance can extend your car's lifespan.


