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The recommended oil for the BMW 320i is 5w-40. Eventually, you will need to change the oil, ideally every 5,000 to 10,000 miles. Failing to do so can lead to engine problems. Using high-quality oil is crucial for optimal engine performance. Neglecting this maintenance could result in issues with the engine, such as a burning odor or poor gas mileage. It is important to address any signs of trouble promptly to prevent potential engine failure.
According to the manual, it is advised to use 5w-40 fully synthetic oil in the bmw 320i.
The decal on the front of the car indicates that the recommended oil viscosity is 0W-20.
Remember to take into account the weather conditions in your area. Opt for thicker oil in hot climates and thinner oil in colder climates. 5w30 is a versatile choice suitable for a majority of locations.