Misunderstanding about car oil First, only add but not replace lube oil There are many car owners only pay attention to check the lube oil quantity, according to the standard, but without paying attention to check the oil quality, ignore replacing the deteriorated engine oil, resulting in some of the engine's moving parts are always in poor lubrication operating environment, thereby increase the wear of lubricated parts. Engine oil must be strictly in accordance with the manufacturers required mileage and timely replacement, in general, the car is driving 3500-5000km, and it should be replaced. Second, add lube oil as much as possible Engine oil is too lack everyone known to harm car. So some owners fear starvation oil that think add more oil than less and better, therefore, often not required to refuel make oil more than the standard. In fact, too much oil has many hazards: 1, when cars drive with crank stir to make a bubble and oil deterioration, increased resistance to rotati ... Read more »