How many liters of engine oil should be added to a BMW 120i?
2 Answers
When changing the engine oil for a BMW 120i, approximately 3.8 liters of oil need to be added. Below is an introduction to engine oil: Classification of Engine Oil: Automotive engine oil is divided into three types: mineral oil, semi-synthetic oil, and fully synthetic oil. Mineral oil is the most basic and cheapest type, generally classified as SJ or below, and is only suitable for low-end cars or some new vehicles. Functions of Engine Oil: Lubrication to reduce wear: Between the engine's pistons and cylinders, as well as between the main shaft and bearings, there is rapid relative sliding, which can easily cause wear. High-quality engine oil can form a sufficiently thick oil film between these sliding surfaces, separating the relatively sliding parts to reduce wear. Cooling and temperature reduction: Engine oil can carry heat back to the oil tank and then dissipate it into the air, helping the radiator to cool the engine.
I've been driving a BMW 120i for almost three years now, and I remember the oil capacity is approximately 4.8 liters, which is the standard for the 2.0-liter engine. I've changed the oil myself several times. The key is to ensure the engine is cool, drain the old oil completely, and then slowly add the new oil. Too much oil can increase internal engine pressure, leading to overheating or part damage, while too little can increase engine friction and accelerate wear. I use synthetic oil like 5W-30, which is more durable, and I recommend changing it every 8,000 to 10,000 kilometers. I usually check the dipstick level to ensure it's in the middle range before driving—it gives me peace of mind. Maintaining the right oil level keeps the car running smoothly and improves fuel efficiency, especially for long-term BMW owners. Don’t forget to check the user manual, as specifications might vary slightly by model year—for example, newer versions sometimes require slightly less oil. Regular checks on these small details can prevent major issues and save a lot of hassle.
