Four misunderstandings of engine oil maintenance

Four misunderstandings of engine oil maintenance

First, is the maintenance period of 5000 mine, 7500 semi-synthetic mine and 1w fully synthetic mine credible? The answer is a rumor. Many people don't believe in user manuals. It is said that the original semi-synthetic engine oil cannot run10000km. Maybe it's this rumor. I've heard a lot. I want to tell you that the life of the oil itself is actually more than 10000, so 5000 or 7500 need not be replaced, but you must pay attention.

The function of engine oil is not only lubrication, but also cleaning, cooling, sealing and rust prevention. The life of engine oil is not determined by the degree of blackening, but by its own cleaning function. It's impossible not to be dark. The only way to correctly judge the engine oil is to go to the testing platform to test its oxidation resistance, viscosity index, corrosion and rust resistance, cleaning ability and so on.

Finally, what is easily overlooked in the lubrication system is the mechanical filter. The service life of mechanical filter is limited, and impurities cannot be filtered after overtime, resulting in excessive wear. Therefore, whether you use 1000 or 20000 kilometers of domestic oil, the machine filter must be replaced according to the instructions, unless you buy a genuine long-acting machine filter, but the probability is not high.

Second, many people think that the oil dipstick is read by cold car. In fact, at present, I think that in addition to the general cold car, of course, GM can also watch the hot car, and the rest are basically hot car reading. The correct way is to stop at the same place or on a flat road after driving for 20 minutes, wait for 3-5 minutes to check the dipstick after the flameout, and judge whether the oil level is normal according to the following figure.

Third, does it matter if you add more and less oil? Don't be like this. Adding too much engine oil will cause the crankshaft connecting rod to stir the engine oil. On the one hand, it will increase the resistance of crankshaft rotation and increase fuel consumption. On the other hand, it will lead to the increase of engine oil content, which will lead to poor engine lubrication and increase engine wear. The engine oil will be sucked through the air holes on the crankcase. On the one hand, it may enter the combustion chamber with gasoline gas, on the other hand, it will enter the atmosphere through the exhaust gas discharge device. Engine oil may also burn in the exhaust gas purification device and damage it.

To sum up, the appearance to consumers is increased fuel consumption, loud engine noise, burning engine oil and destroying three-way catalysis. If you add less, it will be obvious. Insufficient lubrication will aggravate engine wear. Of course, you don't have to worry too much. The engine with the lowest oil content has greater redundancy protection. Is the fourth oil cap emulsification oil emulsification?

Emulsion was found in the engine oil cover and oil port, which is a common condensation phenomenon. Because the temperature of the oil cover is lower than that of the engine (you can still touch the oil cover when the engine is hot), it is easy to accumulate condensed water and produce a small amount of emulsification. Partial emulsification of the oil cover does not mean that the oil is emulsified, so it is necessary to further check whether the oil is emulsified.