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5 mistakes when changing engine oil. Changing the engine oil is a task that seems very simple on the surface, but I must say that the most common cause of mechanical breakdowns in the car engine is related to not changing the engine oil correctly and not following simple tips, which causes the life of the car to be cut in half and the depreciation to increase greatly. . The first mistake is pouring too much engine oil, which many people do, and in this case, there are signs of too much oil in the engine, such as engine oil leakage, a lot of smoke coming out of the exhaust, the smell of burning oil, and an increase in the sound of the car engine. The second mistake is mixing engine oil or pouring two types of engine oil, which some people do, and in this case, it causes the API and SAE indices of the engine oil to change and causes its physical and chemical properties to change. The third mistake is to change the engine oil when it is cold, in which case you have to drive the car for about 10 minutes first. The fourth mistake is not filling the engine oil filter, which should always be filled with some oil when changing the oil filter and put on the car, and I will explain some other mistakes. 00:00 Introduction. 00:26 Pouring too much engine oil. 02:35 Mixing engine oil. 04:44 Changing the engine oil when it is cold. 06:10 Pouring oil into the engine oil filter. 07:45 Too much tightening of the cartel screw. 08:23 Fantasy of motor oil on the ground.