As I mentioned before, one of my passions is cars and I'm always on the lookout for car related articles. I came across an article online about "The Proper Frequency To Change Engine Oil" and want to share it here. I guess many people might think that we should change the oil very often. It is said that the frequency for engine oil change is every 15,000km or every year whichever comes first. That means changing the oil frequently is incorrect. The engine oil has many roles. Most importantly, it protects all the moving parts like bearings etc with lubrication and maintains smooth engine operation. During engine operation, the engine oil is exposed to heat, humidity and is affected by burning gas. Hence, they cause the oil to deteriorate gradually and it will not be able to retain its original performance. It will finally prevent engines from working normally. That's why we need to change the oil periodically. How the car is used also has a big affect on the oil deterioration. In the case that you use a car every day to go to work or go shopping, this will require more frequent oil change. If you often get on the highway, the heat and load by a gear with high speed rotation can also deteriorate the oil quickly. So, it's hard to decide when is the best time to change the oil. The article said that we should follow the maker's recommendation because they set the bar called "Severe Condition" which it's highly unlikely that troubles happen no matter what (The article said that we should follow the manufacturer's recommendation for frequency of oil change. Doing so will prevent any engine damage or performance issues regardless how we use the car). In my case, I always change the oil every regular maintenance. My hobby is a car is incorrect. You can say my hobby is car maintenance/car care/ driving cars. A car cannot be a hobby. I also change the oil every year. I also always change the oil filter at the same time.