Chapter 165: Oil Change

Because there are now two ways to change the engine oil, one is to use a circulating machine, and the other is the conventional replacement method, that is, to unscrew the oil drain screw of the oil pan and put the oil from the bottom.

The method of draining oil from the oil pan is the most common, as well as the easiest and most cost-effective.

To say that this method is simple, in fact, it is not easy for car novices like Mahon compared to those auto mechanics who are very skilled and experienced.

"I think it's very simple, it's not difficult. Ma Hong said a little unconvinced, "I have seen that the masters of the auto repair shop just lift the car, and then unscrew the oil drain screw, and also use an air gun to blow on the oil filler for two minutes, after putting it clean, tighten the oil drain screw and then wipe it with a paper towel to check whether there is oil leakage, nothing so superb technical content, very simple......

"Nothing superb?" Fang Yuan didn't quarrel with the customer, but just asked Ma Hong, "Do you know what preparations need to be done before screwing the oil pan drain screws?"

"Do you have a lift to lift the car?"

"Can you guarantee that you won't get burned by oil because you're not skilled, or if you're not careful?"

"Do you know how much oil to fill up?"

"Did you know that some of the drain screws are disposable?"

"Do you know how much torque is required when the drain screws are tightened on some models?"

......

When Fang Yuan asked Ma Hong's questions, he was always smiling, but one question after another still confused Ma Hong's question, where did he know the question Fang Yuan raised, and he was immediately stunned in place.

Looking at Ma Hong's confused and puzzled face, Fang Yuan smiled, he was not laughing at the customer, he was laughing at himself, if there was no primary maintenance and maintenance skills for second-hand cars, he didn't know that there was so much exquisiteness.

"When draining oil from the oil pan, the car engine must be started and extinguished when the water temperature reaches the normal range. Fang Yuan explained that this is to allow the oil to fully flow in the engine, so as to take away the impurities inside, and ensure that after the oil is replaced, satisfactory results can be achieved.

The next step is to lift the car up with a lift, find the oil pan and unscrew it.

Speaking of this, Fang Yuan said to Ma Hong seriously that if there was no lift, he would not recommend using a jack instead.

Those auto mechanics can do this because they are experienced and know the correct way to use the jack, but what about Mahon? If the jack loosens and moves when he gets underneath, it will be too late to regret it.

"Huh?" Ma Hong thought that what Fang Yuan said was right, and felt that only by lifting the car with a lift could there be enough space and better operation.

"After unscrewing the oil pan screws, you need to pay special attention because the oil inside is very hot at this time. ”

Some auto mechanics use special lifts, they are sometimes paralyzed and careless may be hit, if Ma Hong only uses a jack, operating in such a small space, the slightest dodge, will be burned.

"Hmm. Ma Hong nodded, feeling that what Fang Yuan said was very right, thinking that it was indeed as he said.

"Even if you buy a lift and successfully put the oil away, some models have oil pan screws that are disposable and must be replaced each time along with the rubber ring on the screws. ”

Ma Hong panicked: "Disposable, where can I buy these screws?"

"I mean, some models have oil pan screws that are disposable, but this Trumpchi GS4 is not. ”

Fang Yuan told Ma Hong that the oil pan screws of some models are not only disposable, but also special materials, and torque wrenches must be used when tightening the screws, and the torque indicated by the manufacturer must be strictly observed.

The torque is too large, and it is possible to screw it inside.

If the torque is small, there will be a loud oil leakage, and it needs to be reworked, unscrewed and restarted.

When adding engine oil, it is not just a matter of pouring it as you like.

The filled engine oil must not exceed the highest scale line, otherwise it will not only waste the engine oil, increase the loss of internal power of the engine, and in the long run, it will be filled with a lot of carbon deposits, and in serious cases, there may be artificially caused oil burning.

You must know that the consequences of burning engine oil are very serious, which will cause the blockage of the three-way catalytic converter, and it is even possible to scrap it directly, and it is not a matter of spending a little money to clean up the carbon deposits.

"I see others doing it simply, but I know that it is not easy to listen to your detailed explanation, and I don't think this method is suitable for me. Ma Hong felt that he needed professional tools and rich experience, which was too difficult for an ordinary person like himself who had not been trained, and he was already planning to give up.

But Ma Hong was curious about what Fang Yuan's other method was, and wanted him to briefly explain it to himself.

"The second way is to change the oil with a professional circulator. Fang Yuan said that compared with the traditional oil drain method, the method of changing the oil with the circulating machine can clean up some dirt of the oil pan more thoroughly, and it can also avoid removing the oil drain screws of the oil pan.

However, it takes a long time, wastes oil, requires professional machinery and equipment, and is expensive.

Now, in addition to the after-sales service of automobile 4S shops, only some regular auto repair shops will use the method of circulating machine oil change.

At the same time, not all engines can be changed by circulating engines.

For example, some models do not have mechanical oil gears, so oil can only be discharged from the oil pan.

Hearing Fang Yuan explain that professional machinery and equipment must be used, Ma Hong smiled bitterly, in order to save these few dollars, he couldn't afford to buy a recycling machine.

Listening to the persuasion of others, eating a full meal, and changing the engine oil is already so troublesome, Ma Hong felt that it was not easy to change the three filters, brake fluid, and transmission oil, and finally completely dispelled the plan to do it himself, but was ready to buy things in the future to find a reliable auto repair shop to change.

However, Mahon feels that his maintenance is unrealistic, and it is always okay to simply wash the car, right?

"That's totally fine. Fang Yuan said that the simple thing of cleaning the car can be done casually, as long as the tools are ready, sometimes the effect is no worse than in the car wash.

Fang Yuan suggested that Ma Hong buy a set of water guns, and prepare tire foam brightener, asphalt cleaner, high-foam cleaner, anti-rust lubricant, surface wax and car cleaning soft rubber that can be used for exterior cleaning.

These things are inexpensive and can be easily bought on the Internet and in stores, but the effect is good, such as dirt that is not easy to clean in the crevices of the car, debris and debris in the storage compartment, bird droppings on the surface of the car, etc., can be easily and quickly cleaned up, and a new exterior and interior appear in a few minutes.

Successfully answering Ma Hong's question, Fang Yuan then introduced the fuel consumption of the Trumpchi GS4.

Fang Yuan said to Ma Hong: "This Trumpchi GS4 uses Aisin's AT gearbox, even if it is only a six-speed one, its fuel consumption is not very high, normally eight to ten, of course, it is also related to personal driving habits." ”

"It's okay, the traffic from my home to the company is not very congested, and I don't often drive with floor oil, so I don't think the fuel consumption will be very high. Ma Hong believes that Fang Yuan is right, the level of fuel consumption and personal driving habits do have a lot to do with it.

Ma Hong finally had a question, he heard that there are many problems with domestic cars, and he is afraid that this GAC Trumpchi GS4 is the same.

In fact, regarding the common problem, even if Ma Hong didn't take the initiative to bring it up, Fang Yuan would tell him.

"Domestic cars are exactly what you know. Fang Yuan compared the problems of domestic cars and joint venture cars.

It's not that joint venture cars and imported cars are not bad, and those Japanese cars will still have such and such problems.

It's just that they have other problems, but the main common problems are very concentrated.

For example, the old Cruze is simply a god car that everyone sees and worries, and it can be said that there are many problems.

However, its main problems are relatively very concentrated, as long as you hear the slightest leakage in the engine compartment, you can guess that it is the valve chamber cover leakage, in addition to engine knocking, oil leakage into the coolant, transmission module damage, etc., all of which are the common problems of the old Cruze very concentrated outbreak.

Another example is the Mazda CX4 styling sport, good handling, good directivity, its problems are mainly focused on poor sound insulation, after more mileage, engine shake, gearbox abnormal noise, steering column abnormal sound and other problems.

The domestic car is different, the same batch of 100 cars, can have a hundred kinds of problems, the owner usually needs careful maintenance, diligent observation and attention, as long as timely maintenance will not be much of a problem.

Specific to this GAC Trumpchi GS42018, there is an indirect oil cut-off at the start, the engine lacks cylinders, resulting in insufficient power and shaking noise, and the air conditioner shakes even more.

Not only does its engine shake loudly, but there is also a certain chance of oil emulsification, but the one Mahon wants to buy does not have this problem.

In addition, Aisin's six-speed AT gearbox also has stuttering and abnormal noises, and it is difficult to hang in the first and second gears in winter, and there is a sound of jamming.

Compared with abnormal noise and jitter, the quality of the battery of the 2018 model is too poor, and the loss of power seriously affects the normal use.

Fang Yuan reassured Ma Hong that the Trumpchi GS4 in front of him had been replaced with other brands of batteries, and there should not be a phenomenon of running too fast.

......

Fang Yuan made all the advantages of this car clear, Ma Hong felt a feeling of smoothness, and Fang Yuan gave a maintenance note, after thinking about it for a while, he decided to buy this 2018 Trumpchi GS4235T automatic two-wheel drive elite version.

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