How much is the oil of No. 97 now

According to the adjustment plan, starting from January 2012, the gasoline grades 90, 93 and 97 were revised to 89, 92 and 95. So, the former No. 97 gasoline is now the current No. 95 gasoline. This gasoline is 95% isooctane and 3% n-heptane.

At present, the gasoline used in family cars in China is basically 93 gasoline and 97 gasoline.

No. 97 gasoline is gasoline containing 97% isooctane and 3% n-heptane. No. 93 gasoline is the gasoline with an octane rating of 93. The level of gasoline marking only indicates the size of the octane number of gasoline, and different grades of gasoline should be selected according to the different compression ratio of the engine.

Mid-range cars with compression ratios between should generally use 93 gasoline; Cars with a compression ratio greater than 97 should use 97 gasoline.

What is the difference between these two gasolines:

1. The compression ratio is different: the mid-range car with the compression ratio between should generally use No. 93 gasoline, and the car with a greater compression ratio should use No. 97 gasoline. Nowadays, the compression ratio of domestic cars is generally above 9, and it is best to use 93 or 97 gasoline.

The primary criterion for selecting gasoline grades for automobiles is the compression ratio of the engine, which is also the core energy-saving index of contemporary automobiles.

2. Different octane number: The difference in octane number is the fundamental difference between 93 gasoline and 97 gasoline, and the label of gasoline is the embodiment of different octane number. The octane number is different, that is, the anti-knock agent is added.

If the octane number is high, the knock resistance of the fuel is good, and vice versa.

In general, there are three ways for a plant to increase the octane number of gasoline:

The first is to select good raw materials and improve processing technology, such as the use of catalytic cracking and other secondary processing;

the second is to introduce high-octane number components with excellent anti-knock resistance, such as isooctane, cumene, etc., into the product;

The third is to add antiknock agent.

Photo by Q&A) @2019

The original No. 97 gasoline is now No. 93 gasoline.

No. 97 gasoline is 97% isooctane and 3% n-heptane. If the compression ratio is high and the low-octane gasoline is used, it will cause abnormal combustion, resulting in shock, fuel consumption and driving weakness. ‍

No. 93 oil is more expensive than No. 90 oil5, but the energy consumption is also about 5 smaller, from the 100 kilometers of fuel consumption money ratio, theoretically equal. However, considering that the 93 oil matching high compression ratio engine with 90 oil will occur secondary combustion and incomplete combustion, will lose an additional 5 -8 power, and then consider the increase in maintenance costs caused to the vehicle, the decline in vehicle condition, the reduction of life and a series of consequences, the cost of reducing the standard of oil will go in.

97 gasoline began to be widely available in the domestic market. Some riders have also fallen into a misunderstanding about the use of gasoline, that is, they are keen to use high-grade gasoline. Even some riders regard the marking of gasoline as a standard of purity and quality of the oil.

This is wrong. In fact, the level of gasoline label only indicates the size of the octane number of gasoline, and the label must not be confused with purity and quality. If the engine with No. 93 oil insists on using No. 97 oil, there will be a phenomenon of "stagnant combustion", that is, it is not yet the spontaneous ignition point when it is pressed to the head, and there will be incomplete combustion.

The relevant person in charge of Sinopec reminded the owner that before using the vehicle, he should carefully read the instruction manual and pay attention to the compression ratio. 90 gasoline is selected for the compression ratio below, 93 or 95 gasoline is selected for the compression ratio, 95 or 97 gasoline is selected for the compression ratio, 97 or 98 gasoline is selected for the compression ratio, and gasoline with a compression ratio of 98 or more should be selected.

Gasoline is the higher the grade can withstand the greater compression ratio, 97 is definitely higher than 93 compression ratio. High compression means high power"(For example, if you use a No. 93 car with 97 oil as an engine standard, because the engine compression ratio is only designed for No. 93 oil (such as 10:1), and No. 97 can withstand 12:.)

1 compression ratio, the engine compression ratio can not reach, not only can not get better power, but also waste RMB, if the standard 97 oil plus 93, because the 93 compression ratio is low, and the high compression ratio of the engine plus low grade oil, when the piston is compressed up to the top of the cylinder 93 oil will burn due to the low compression ratio, loss of power, but the impact is not big, from time to time to change is not much problem, but not often, mainly look at the engine design and function, see what oil you use on the car manual.

Hope it solves your problem.

First of all: the number 97 is expensive.

And then the reason:

These numbers are the octane number of gasoline. It is an evaluation index of gasoline knock resistance.

The octane number, which is the designation of gasoline, is the ratio of the actual gasoline knock resistance to the knock resistance of standard gasoline.

Standard gasoline is composed of isooctane and n-heptane. Isooctane has good knock resistance, and its octane number is set at 100; N-heptane has poor knock resistance, and is prone to detonation on gasoline engines, and its octane number is set at 0.

For example, 90 gasoline means that the gasoline of this grade has the same knock resistance as standard gasoline containing 90% isooctane and 10% n-heptane.

From an economic point of view, the higher the cost of extracting high-purity isooctane for gasoline when refining. Therefore, number 97 is more expensive than number 93.

In order to reduce costs, multi-component alkanes containing isooctane of a certain purity are generally extracted and then anti-knock additives are added, which can significantly improve the anti-knock performance of gasoline. We can figuratively call it "blending".

The various grades of gasoline have nothing to do with how clean the gasoline is. Car owners should not be misled by the idea that high-grade gasoline is cleaner;

When choosing gasoline, the higher the grade, the better. Gasoline should be added according to the compression ratio of the engine or follow the recommendations on the car's instruction manual, which is more scientific and economical, and can give full play to the power of the engine.

Some of the above buildings, it is better to be responsible, do not guess and mislead others if you don't understand.

During the design phase of a car engine, the fuel used is labeled according to the compression ratio.

To put it simply, higher compression ratios can use higher grade fuels. The higher the fuel grade, the slower the oil burns, the lower the combustion knock, and the higher the compression ratio is required for the engine; On the contrary, the combustion speed of low-grade fuel is faster, the combustion knock is large, and the engine compression is relatively low.

The marking of the fuel also involves the issue of engine ignition timing. Low-grade gasoline burns fast, and the ignition angle should lag; The combustion rate of high-grade fuel is slow, and the ignition angle should be advanced. For example, an engine should add No. 93 gasoline according to the requirements of the manual, and now No. 90 gasoline is added, and the timing light needs to be used to adjust the ignition advance angle lag by one to two degrees.

If you do not follow the advice of the OEM, use low-grade fuel, and do not adjust the ignition time, it may cause difficulty in engine starting; When accelerating, there is a crisp sound of metal crashing inside the engine; After a long drive, the engine shakes or does not stop when the ignition is turned off.

When choosing gasoline, the higher the grade, the better. The main basis for the selection of gasoline marking is the compression ratio of the engine. Parameters such as compression ratio and ignition advance angle have been set in the engine computer, and the owner will have absolutely no problem as long as he chooses gasoline in strict accordance with the requirements of the instructions.

In the engine computer program of modern automobiles, there is an adaptation program for micro-adjustment of gasoline with poor explosive resistance, but there is no corresponding program for high-grade gasoline. Therefore, the blind use of high-grade gasoline will not only produce the phenomenon of acceleration weakness while driving, but also the advantages of high anti-explosion can not be brought into play, and it will also cause a waste of money.

Octane number. 97 expensive.

But it's not necessarily expensive to use.

If the landlord has been using the number 93, then use the number 93 all the time. Using 97 will lead to a bad mix of two gasoline.

It's more dangerous.

No. 97 oil is expensive.

The main reason is that No. 97 oil contains more ingredients than No. 93, which is conducive to ignition.

93 97 is the octane number, the higher the octane number, the better the oil, the more expensive.

The evaluation index of gasoline knock resistance is the octane number, that is, the number of gasoline. It is the ratio of the knock resistance of the actual gasoline to the knock resistance of the standard gasoline. Standard gasoline is composed of isooctane and n-heptane.

Isooctane has good knock resistance, and its octane number is set at 100; N-heptane has poor knock resistance, and is prone to detonation on gasoline engines, and its octane number is set at 0. If the gasoline is labeled 93, it means that the gasoline of this label has the same knock resistance as standard gasoline containing 93% isooctane and 7% n-heptane. There are 3 benefits to using 97 fuel:

First, there is not much difference in economic calculation, and now the difference between No. 97 gasoline and No. 93 gasoline on the market is about yuan, but the actual running No. 97 gasoline is more fuel-efficient than No. 93 gasoline; Second, it is good for the engine, adding 97 gasoline can prolong the service life of the engine, because the carbon deposit in the combustion chamber of the 97 gasoline engine is much less, and the carbon deposit of the spark plug is also less. With less carbon deposit, the service life of the engine and spark plug is extended; The third is the obvious benefits of power, this phenomenon may not be very obvious in the general car, but with 93 gasoline, the throttle is more dull, and with 97 gasoline, the throttle is obviously easier to step on, and the speed is also very fast, which is mainly because 97 gasoline burns more fully than 93 gasoline.

Purity, the number is low and the mixture is more.