[Car basic knowledge]The best time to change the oil in a car

The most basic and most commonly used is to change the oil according to the mileage. For example, it can be changed every 5000 kilometers and 7500 kilometers. There are other interval methods for oil change, such as physical and chemical testing, which is to take out the oil with a laboratory method to look at such as kinematic viscosity, acid value (diesel), etc. This is the most accurate method. But most people do not have such conditions. Another thing is to take out the oil and judge by seeing and touching the experience, which is not easy to master. Here is a more scientific oil change interval for you, which is the time method Everyone knows that if the vehicle is running at a high load, it will accelerate the attenuation of the oil performance. 99% of engine oil is base oil and 1% is additive. If the additive is attenuated, the engine oil is useless. General high-load operation conditions: 1. Towing a vehicle. (There is basically no such problem in domestic cars) 2. It often runs in the red line area. (Too few, unlikely) 3. The temperature is below zero / dusty environment / rugged / salty road 4. (The most relevant part) Short-distance driving, often within 10 kilometers. Idle for a long time and drive slowly for long distances. (Typical city car environment) In the fourth case, it is considered to be higher than the load of normal economy mode driving. The usual economic mode is 60-90 km/h. Isn't the problem obvious in this case? In the golf dashboard display mode 2, there is an average speed. If the average speed is displayed as 75 kilometers per hour, in the economy mode speed, then driving for 100 hours is 7,500 kilometers, and the oil needs to be changed. If the average speed is displayed as 25 kilometers per hour, then driving for 100 hours is a mere 2500 kilometers. The latter's 100-hour load is higher than the former's 100-hour load. In short, the oil needs to be changed for 2500 kilometers. The effective cumulative time of engine oil is definitely not the same for different brands, grades, mineral oils, and synthetic oils.But ascarUsers need to have such a concept, and they can’t admit death at 7,500 kilometers. The interval of 7500 miles is too long under normal urban conditions, especially in large cities. I looked at my records and couldn't believe it. The average speed in the last 500 kilometers was only 16 kilometers.Long-term highwayBenzYes, more than 10,000 kilometers is not a problem. There are many strings in your head, and the time interval method for changing the oil is harmless. Related: ·Listen, try, see, think, judge abnormal engine noise
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