A car is made up of thousands of parts，So I am using the car、Car maintenance、Repair your car，Even when it comes to new cars, there will be some ambiguous information to confuse new and old car owners。This information is either completely wrong，Either it is not rigorous enough or too one-sided，This is also a question asked by many car owners。

But be careful if you want to reduce carbon deposits, which accumulate over the years，You have to use the fuel treasure all year round，Promotes higher costs。Since Fuel Treasure improves gasoline combustion, it will not make the car more fuel-efficient，So it’s wrong to save fuel with the fuel treasure。

Also，The choice of car fuel treasure is very important，Be sure to choose a brand with guaranteed quality (the one produced by the manufacturer is better)。If you use inferior fuel oil，Not only can the combustion in the cylinder not be improved, but it is also counterproductive，In severe cases, it may also damage the three-way catalytic converter。

To put it simply, using a variable air conditioning pump means slowly increasing (decreasing) the compression ratio (variable) as needed during work，To reduce the interference caused by the periodic clutching of the compressor to the car engine (consumption of engine power) and reduce the noise，The variable air conditioning pump will control the displacement of the air conditioning pump according to the temperature to achieve the purpose of reducing fuel consumption。

So cars with fixed displacement air conditioning pump，Whether it is a manual air conditioner or an automatic air conditioner, the cooling capacity (temperature level) must be adjusted，In fact, it just adjusts the size of the damper (temperature control switch) and does not have much technological content，As long as you turn on the air conditioner, the fuel consumption is almost the same as the rated temperature、The air volume has nothing to do with it (as to why increasing the air volume increases the idle speed，You can ask the generator)。

Although the higher the oil grade, the better the performance (the oil grade indicates the low-temperature fluidity of the oil、High temperature wear resistance, etc.，The quality grade indicates that the oil is fully synthetic、Semi-synthetic engine oil)，But for ordinary engines or older cars，Using engine oil with a high grade is not necessarily a good thing，Old car engines have larger clearances due to wear (and some low-end cars have larger cylinder clearances during the manufacturing process)，So using fully synthetic engine oil may cause oil channeling，As a result, oil burning occurs、Excessive carbon deposits and other phenomena，So when choosing engine oil, only choose the right one，There is absolutely no need to choose a high-grade engine oil scale。

Manufacturers will also take the rear situation of the hatchback into consideration when designing，Generally, the ability of the rear to withstand impacts will be strengthened。The rear of all current hatchbacks，There is a certain collision and deformation area design，Enough to absorb the impact energy generated by a collision。Of course, the safety of a two-box car mainly depends on the car manufacturer、Automobile development platform、Material application, etc.。So there is no question of which form is safer between hatchbacks and sedans，This problem only exists between the development platform and the brand，To put it bluntly, it’s the manufacturing process、Manufacturing Materials、Differences in brand technology, etc.。

The second is after adding a skylight，Cars need to undergo a series of more safety tests，Including vibration fatigue test of long-term use of roof、Roof rollover and roof compression test、Noise in the car、The impact of body temperature and occupant protection system during collision, etc.。Except these beams，Whether it is a metal roof，The panoramic sunroof and the roof are nothing more than a layer of skin，Little impact on overall passive safety。When a car is involved in an accident，The sunroof glass will break into small pieces to protect the people inside the car to the maximum extent，Now there is one more escape exit。Comprehensive of the above，Cars with sunroofs are safe。

Run-proof tires can be simply understood as strengthening the thickness of the tire sidewall，Able to support the weight of the car when deflated and travel at a considerable speed。So the run-flat tire will still blow out，Ordinary tires will lose control of the car the moment they burst，If the speed exceeds 160km/h, the mortality rate will reach 100% (Note: Use the brakes carefully at the moment of tire blowout)。

There is no difference from ordinary tires at the moment of puncture，Because all the load will be concentrated on the seabet appside of the puncture at the moment of tire puncture, the car will temporarily lose control，Just hold the steering wheel and release the accelerator，The run-flat tire will give the car some support with a very tough and supportive sidewall，Enables the car to regain control，So run-flat tires can also blow out, but the car is easier to control when a tire blows out，This is enough for tires。

So it seems too trivial to consider car safety from the thickness of the car skin，The main stress conditions of automobile passive safety、Frame material stiffness and force transmission route。But high-strength materials alone are not enough，There is a limit to the force a person can withstand in a car collision，Even if the hardest material is used, it will still be useless if the force on the human body during impact exceeds the endurance range，So the impact force is dispersed (and absorbed)，It is also a very important section in car safety。

The power of engines with T is often higher than that of naturally aspirated engines，For example 1.The power of an 8T engine is approximately equivalent to 2.2L naturally aspirated engine，Under the same load1.8T engine is obviously better than 2.2L naturally aspirated engine needs to save fuel，Besides, turbocharged engines are becoming increasingly mature，The speed of turbine intervention is getting lower and lower，The intervention delay is getting smaller and smaller，The phenomenon of oil burning is becoming less and less obvious，The service life is getting longer，So as automobile technology upgrades, turbocharged engines will become more and more fuel-efficient instead of consuming fuel。

In fact, there seabet appmay be slight shaking when parking，That’s because between the parking pawl and the slot of the P gear、There are gaps between other transmission components。(This phenomenon does not occur when the vehicle is in P gear when the vehicle is stopped) The current car control program is very good，Some cars are slowing down and stopping，The car’s control unit begins to perform calculations according to the program，The transmission responds immediately when the car owner stops or continues driving。The performance of the dual-clutch transmission is particularly outstanding，Greatly reduces shift shock and shift time，So there is no need to shift to N first，Move to P again，P gear is a gear specially designed for parking。

The fact is that the input shaft runs with the sun gear when in neutral，Also drives the planetary wheel to rotate，The planetary wheel drives the ring gear to rotate，But because it is in neutral, the ring gear and planet carrier are not fixed，The input power is not transmitted to the output shaft，Then the governor will not send a speed signal to the transmission oil pump (will not interrupt the oil pumping)，The oil pump is behind the torque converter，In other words, the oil pump is always working，At least a basic pressure will always be maintained in the gearbox。

The question is whether this basic pressure can meet the lubrication and heat dissipation of the gearbox。The transmission oil pump can pump oil but has pressure，So it’s not what many people say，In a short distance, the transmission will not be lubricated and cause damage。(The towing distance of some high-end automatic cars is limited to 50 kilometers)

Of course it is not recommended that you coast in neutral when going downhill，It is not a problem of transmission damage，It’s a matter of personal safety。Because the braking effect of the engine is lost when going downhill in neutral (some cars have traction control systems)，The speed will get faster and faster，If an emergency occurs at this time，The consequences are disastrous。(The content of the article comes from the Internet，If copyright is involved, please contact us to delete)