What is fully synthetic motor oil?

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What is fully synthetic motor oil?

When it comes to motor oil, there are so many reference values, categorized into south and north, which cars, which engines, German cars, Japanese or Korean cars, etc. Why are so many car enthusiasts so concerned about motor oil? One is related to the cost of car maintenance, the oil is the big head; because maintenance is essential after buying a car, the most common maintenance program is to change the engine lubricant. Of course, oil and oil filter cartridges need to be changed at every maintenance visit, so it's not unusual for special attention to be paid.

When you take your car to a service store for maintenance, you've been asked if you use full or semi-synthetic oil. Do you understand the meaning of “full” and “semi”?

We usually refer to fully synthetic engine oils as 100% high quality oils made from polyolefins or synthetic esters. Typically, the oil is labeled with the word “synthetic” on the drum. However, on a simpler understanding, motor oils formulated with Group IV and V base oils, without the addition of mineral oil blends, can be called fully synthetic.

Fully synthetic motor oils are characterized by good stability and durability, so generally speaking, the oil change period of engines using fully synthetic motor oils can be extended to 7,500-10,000 kilometers.

Because the stability and anti-aging ability of fully synthetic engine oil is incomparable to other mineral oils, this is one of the reasons why high-end brands such as BMW or Mercedes-Benz specify the use of fully synthetic engine oil of XXX brand. Especially for vehicles with supercharged technology engines, when the supercharged parts start to work, the engine torque will increase exponentially. At this time, the oil film covering the engine crankshaft must withstand shear forces several times higher than before, and the higher quality fully synthetic engine oil can fully meet the requirements of the oil film.

From the price point of view, in 4S stores or quick repair stores, the price of a bucket of conventional 4L mineral oil is mostly about 150~200 RMB, semi-synthetic about 250~300 RMB, and most of the fully synthetic ones are more than 350 RMB (data source from the Internet, for reference only). Considering the oil change period, mineral oil is not cost-effective and full synthetic oils are all more cost-effective. Which one is more suitable, I'll know once I do the math.

Summarize: a car is a machine made up of thousands of parts. Engine parts are matched to each other with exceptional precision, which inevitably creates friction. One of the functions of motor oil is to reduce friction. In addition, the oil has the functions of cooling, cleaning, sealing, rust prevention, corrosion protection, vibration damping and cushioning. Engine wear almost always occurs during cold starts, so it is necessary to choose a better oil.