Hello everyone！Recently received a question from a netizen。His car has driven more than 360,000 kilometers in 7 years，I think it’s okay when it’s on，Is there anything I need to pay attention to？Is it necessary to change the car？

Driving an average of more than 50,000 kilometers a year，As a private car，It is indeed used quite heavily。But in fact, it is put into the larger scope of "car"，There are many cars with long mileage。

For example, any taxi.

Li Tuan took a ride on a domestic hitchhiker a while ago，Rated nearly 200,000 kilometers in four years，Learned while chatting with the driver，In addition to normal maintenance，Not repaired，It’s quite worry-free ~ Like for domestic products！

So，Long mileage，It does not mean that you must change your car，Old cars can still be very energetic。Of course，The prerequisite is proper maintenance。

Everyone usually maintains their car，Generally, it is the conventional "three oil filters"，That is, change the oil、Oil filter、Air filter、Air conditioning filter，After replacement, it will be able to live vigorously for another 10,000 kilometers (there are still 5,000 kilometers)。

And some old cars，Due to age、Long mileage，Many items that do not need to be done for daily maintenance，Starting to pay attention too，In fact, he is like an old man。

Let’s talk about these aspects with all our group members today. About the maintenance of old cars，First, the number of projects will increase，Second, many new cars require regular maintenance，The years are getting longer，It was disrupted。

So, you can have regular physical examinations. Let’s first take a look at those things that may affect driving safety，Or projects that cause serious failures，For example:

 

Braking system

The first thing to say is the brakes，Braking is the most important part of driving safety，But seabet loginit is rarely touched during daily maintenance。

Perhaps the most frequently replaced items are brake pads and brake fluid。However，Because everyone’s driving habits are different、The road conditions you usually drive on are also different，The degree of brake usage is also different。So the advice given in the maintenance manual is generally “regular inspection”。

 

There will be a sharp and harsh metal friction sound when driving or lightly applying the brakes，It means it’s time to replace the brake pads，Some cars may also have the brake malfunction light on。

If the brake pedal feels soft，That means you need to bleed air from the brake oil line or change the brake oil。 And the brake disc，Generally everyone does not think it is a lossy part。It will also be used during braking，Slowly being worn away，But when is it time to replace it?？ This replacement standard is actually on the car，But no one notices。There is a parameter engraved on the joint of the brake disc: MIN TH, minimum thickness.

 

If you have the chance, you can look at the MIN marked on your brake disc What is TH，Take a ruler and measure how much is left，You will know if you should replace it。

 

Line check

This mainly includes oil lines and circuits。Most parts of the oil line are made of metal，But some connections will be sealed with rubber，Long time、Big temperature changes，There is also aging、Possibility of leakage，Always pay attention to whether there is oil leakage in the engine room。

The main purpose of the circuit is to check whether the wires are damaged，If oil leaks from one side，Leakage on one side，The risk of spontaneous combustion will be greatly increased。Always pay attention to the cleanliness of the cabin，Easier to see leak location。

 

Timing belt

The valve timing belt is just a rubber belt，Responsible for when to open the valve，Let air enter the cylinder，The pace needs to be coordinated with the movement of the piston。Because it is rubber，So it will also age。Generally, replacement is required between 60,000 and 100,000 kilometers。

If you don’t cooperate well，When the valve is opening，The piston is also coming up，The valve may be stuck due to the top bend，If it is serious, it will seabet appbe smashed directly，Hand the cylinder、Piston scratched，Even the crankshaft is deformed，The entire engine is scrapped。

tire

Tire replacement，For those car owners who drive long distances, there is no need to remind them。These experienced drivers generally know to replace tires according to the wear mark in the middle of the tread。

What is often overlooked is that the years are very long，But it’s a car that I rarely drive。 Tires are also rubber，Dense cracks，It will also be exposed to ultraviolet rays、Gradual aging due to temperature changes，Dense cracks，Double the risk of tire blowout。

Generally speaking, even if a tire is not used very much，5 to 6 years has reached the end of life。For driving safety，It’s better to replace it as soon as possible。

The above items will affect vehicle safety，Old cars often have some "minor problems"，Although it won’t stop the car from driving，But if you pay more attention，Can optimize driving quality、Extended service life。

Mainly lists the following aspects:

 

Transmission oil

The gearbox determines the performance of a car、Driving quality、A component that is very important for driving quality，There are many cars because one is unreliable、Not smart gearbox，Destroyed the whole car。

Of course，We are not going to talk about gearboxes that are inherently "faulty" here，Bought because of the car，There is no way to replace the gearbox，If you want to exchange it, you can only exchange it for the same model。

Transmission oil，It acts as lubrication、The role of heat dissipation。Transmission oil can actually be regarded as "engine oil"，It is similar to engine oil 0W20、5W40 this kind of label。But the viscosity of transmission oil is much higher，Usually between 70 and 90。Some loads are heavier、A performance car with a relatively high speed，Even 140、Viscosity of 160。

(Cars with limited slip differential (LSD) use transmission oil viscosity of 80W140) So，Motor oil needs to be changed regularly，Of course the transmission oil is also needed，When it ages、It becomes ineffective after becoming thinner，Not only wear and tear occurs，It will also affect the shifting quality。Depending seabet myon the brand，Usually replaced only once every 80,000 to 120,000 kilometers。As for those so-called "maintenance-free" ones，Just treat him as casually talking。

Not paying attention to the life of the transmission oil，I won’t let the car sit down immediately，But it will bring "chronic diseases"，And once it breaks out，It will be difficult to recover。Generally speaking, it is the price of replacing a gearbox。

 

Carbon deposit, spark plug, fuel filter

Put these together，Mainly because the faults they cause are similar，All of them will lead to loss of power。

Carbon accumulation is a common topic，If it’s not serious，No need to clean up。And serious，In addition to dismantling the engine and digging for coal，There is no particularly good way to remove it。

If the carbon deposit is serious，Can cause engine vibration、Lack of fire、Knock, etc.