"Inner roll" between antifreeze ~
Spend 3,000 yuan to upgrade the oily antifreeze, is it necessary?
To answer this fan's question
I went out of my way to buy a liter of oily antifreeze back
Hopefully, I'll give him an answer through the following 6 comparisons
The so-called oily antifreeze, anhydrous antifreeze oil, etc. on the market now are actually high-concentration propylene glycol antifreeze.
I learned from fans that the antifreeze oil that the 4S store was going to change for him was an American brand evans, and this antifreeze oil was not really oily and not completely water-free.
Because I looked up the ingredient list of evans antifreeze oil, it has a water content of 0.5%.
So it is the same as the water-based glycol antifreeze used in our ordinary family cars, and it is also water-soluble, except that it has less water content, so it looks more like oil.
I checked it out, the current -40 ° C propylene glycol antifreeze, the market price of 95 yuan per liter, -50 ° C ethylene glycol antifreeze, the market price is about 20 yuan per liter.
The difference in the price of the two antifreeze is so large, mainly because of the different raw materials.
And I inquired about the transaction price of the raw material market on January 5, the ex-factory price of propylene glycol is currently hovering around 16,000 per ton, while ethylene glycol is hovering around 0.55 million per ton, and the price difference is about three times.
I checked, the lethal dose of ethylene glycol is 1.56g/kg, a 75 kg adult, after drinking 117 grams of ethylene glycol, that is, about 200 grams of -50 ° C water-based antifreeze, will die.
Propylene glycol, on the other hand, has a lethal dose 345 times smaller than ethylene glycol! A 75-kilogram adult would have to drink about 70 kilograms of propylene glycol antifreeze at once to die...
Therefore, propylene glycol is safer and more environmentally friendly than ethylene glycol, and the scope of application is also larger than ethylene glycol. So its market demand is also greater.
This is also why propylene glycol antifreeze will be more expensive than ethylene glycol antifreeze, but expensive does not mean that propylene glycol is more advanced!
We ourselves buy propylene glycol antifreeze online for less than 100 yuan a liter, and a family car can use up to 8 liters of antifreeze, which means that the material price is about 800 yuan.
Plus the man-hour cost of replacing the antifreeze once, it is 500 yuan for the expensive point, and the total is only 1300 yuan!
So if you want to replace the oil-based antifreeze, the total price exceeds 1500 pieces, it is not cost-effective.
After the test of the freezing point detector, the actual freezing point of the oily antifreeze is -41 ° C. The actual freezing point of the water-based antifreeze is -49 ° C, which is basically the same as the freezing point marked on the packaging.
However, their boiling point is different. The boiling point of the oily antifreeze is as high as 191 ° C, while the boiling point of the water-based antifreeze is only about 120 ° C.
The freezing point of the antifreeze is important, but the boiling point is equally important!
Because when the engine continues to run at high loads and produces high temperatures, the antifreeze in the engine may boil to produce a large number of bubbles, which will increase the internal pressure of the engine cooling system.
The cooling system of each vehicle is a pressure relief device, at this time the pressure relief device will begin to depressurize, it may spew out gaseous antifreeze or liquid antifreeze, which will cause the loss of antifreeze inside the engine, so there will be a lack of antifreeze.
However, if the boiling point of the antifreeze is high enough, such as oily antifreeze, it will not boil so easily, and the pressure loss of the engine cooling system will be much smaller, which is more convenient for ordinary car owners.
At 20 °C, the specific heat capacity of the oil-based antifreeze is 2.49, while the specific heat capacity of the aqueous antifreeze is 3.084. This means that the temperature of the oil-based antifreeze will be higher when the engine generates the same heat.
From another point of view, that is, the oil-based antifreeze can make the engine reach the optimal operating temperature faster, which is a good thing for the engine, it can make the car more fuel-efficient during the cold start stage.
But there are also disadvantages, that is, the engine can not work for a long time with high loads, such as long-term traffic jams, or climbing mountains, running deserts and so on.
Because in the same cooling system, the heat dissipation rate of oil-based antifreeze is slower than that of water-based antifreeze.
Therefore, in extreme cases, it is likely that the high temperature of the antifreeze will lead to the high temperature of the engine, and the cylinder bed will crack, resulting in the failure of the cylinder pulling, pulling the tile, crankshaft and so on.
These failures can directly cause the engine to be scrapped, so I do not recommend that the family grocery cart change from water-based antifreeze to oil-based antifreeze.
And the cooling system of most family car engines is designed according to the parameters of the water-based antifreeze.
Compared with the luxury cars that are equipped with oil-based antifreeze, the cooling system of ordinary family cars is still a bit inferior to the temperature control of the engine, and it is impossible to carry out precise regulation and rapid heat dissipation in extreme cases.
Therefore, there will be many people on the Internet who say that after their car has changed the oil-based antifreeze, there will be a high temperature.
If you have to replace the water-based antifreeze of the original car with an oil-based antifreeze, it is best to do some additional upgrades.
For example, replace the engine with a lower opening temperature, replace the thermostat with a cooling system with a larger power, replace the pump with a thicker engine, replace the cooling pipe with a water tank with stronger heat dissipation capacity, fan, and so on.
This improves the heat dissipation capacity of the engine. Reduces the effect of oily antifreeze having a smaller specific heat capacity.
The service life of oil-based antifreeze is very long, generally 15 years or 800,000 kilometers to replace once, water-based antifreeze replacement cycle is only 2 years or 40,000 kilometers, or 3 years and 50,000 kilometers to change once.
Because the main raw material of the water-based antifreeze is ethylene glycol, containing hydroxyl groups, it will be oxidized into glycolic acid in the cooling system of the engine for a long time, and then oxalic acid, which has obvious corrosive effects on metals.
Therefore, even if ethylene glycol is added with various preservatives, the antifreeze liquid needs to be replaced regularly.
The above problems do not exist here in the propylene glycol antifreeze, its chemical properties are more stable, so the service life is much longer.
summary:
If you usually drive in the city, you usually don't get stuck in traffic, you don't plan to drive out for a self-driving tour, and you plan to drive a car to the newspaper.
Then spending 1500 yuan to upgrade an oily antifreeze is completely fine. It can even help you save about 5% to 10% of your fuel bill.
If you usually drive in the city and it is very congested, you occasionally want to drive out for a self-driving trip, and you don't mind going to the repair shop regularly to maintain the car, and you plan to change the car for a few years.
Then there is no need to upgrade the oil-based antifreeze, which is not only a waste of money, but also the risk of damaging the engine.
If this review has helped you, then please forward it to your friends and give me a thumbs up. If you want more do-it-yourself maintenance car poses, or see me. More reviews for automotive supplies. Then pay attention to the road car master brother every Wednesday and Friday update, we will see you next time, bye bye~
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