When Does a Car Air Conditioner Need Refrigerant Recharge?

What is the optimal number of hours for driving practice per day?

The optimal duration for daily driving practice is four hours. Key considerations during driving practice: Quick eyes and fast feet/hands. Mastering clutch-throttle coordination during parking and starting phases, as well as following techniques at intersections, requires promptly placing the right foot on the brake pedal. Determine braking intensity based on the situation, followed by adjusting the vehicle's swing direction. The sequence, positioning, and coordination of these actions directly impact driving safety. Driving practice techniques: Using rearview mirrors, align with the midline of the vehicle ahead as a reference point. When half of the rear wheel crosses this line, turn the steering wheel fully for reversing. Return the steering wheel after the vehicle enters two-thirds of the parking space.

10

3

Share

Do new cars need an oil change in winter?

New cars do not require a special oil change for winter. There's no need to specifically switch to winter oil for new cars because manufacturers have already added the appropriate oil based on the sales region before the vehicle leaves the factory. Introduction to engine oil: Engine oil, also known as engine lubricant, has a density of approximately 0.91×10 (kg/m). It serves multiple functions for the engine, including lubrication and friction reduction, auxiliary cooling, sealing to prevent leaks, rust and corrosion prevention, and shock absorption. It is often referred to as the 'blood' of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of lubricants, determining their fundamental properties, while additives compensate for and enhance the performance shortcomings of the base oil, providing certain new characteristics. Additives are an essential part of lubricants. Impact of low temperatures on engine oil: At low temperatures, engine oil tends to thicken, making it difficult to flow smoothly, and in some cases, it may even stop flowing entirely. This requires more time for the oil to reach critical engine components to provide lubrication and protection. If the vehicle is driven immediately after starting, it can lead to dry friction. Over time, this can damage the internal cylinder walls, causing abnormal engine noises, severe idle vibration, and even oil burning phenomena.

7

0

Share

Is It Normal for the Oil Dipstick to Reach the Lower Limit at 5,000 Kilometers?

When the car's oil dipstick drops by 1 centimeter after 5,000 kilometers, it does not indicate oil burning and is considered normal. Hazards of High Oil Temperature: Prolonged exposure to high temperatures can cause engine oil to corrode and age, thinning the oil film and making it more likely to enter the combustion chamber. Using high-quality oil can significantly delay this phenomenon. Carbon deposits are an inevitable byproduct of fuel combustion and are the root cause of various car issues, such as aging valve seals and increased piston-cylinder wall gaps. Consequences of Engine Oil Burning: If the oil level is too high (exceeding the maximum mark), excess oil can easily enter the combustion chamber (due to excessive internal pressure), forming sticky carbon deposits. While initial impacts may not be noticeable, over time, the buildup of carbon deposits will inevitably worsen.

20

0

Share

How many hours can I practice for Subject 2 each day?

Normally, the maximum accumulated practice time for Subject 2 is 4 hours per day. Basic test items for Subject 2: Post parking, slope fixed-point parking and starting, parallel parking, passing single-plank bridge, curve driving, right-angle turning, speed-limited passing through restricted-width gate, passing continuous obstacles, hundred-meter gear shifting, and bumpy road driving. Subject 2 examination rules: All five test items must be passed at once for the examination to be considered successful. There are a total of two examination opportunities, meaning one initial test and one make-up test. If the first test is failed, a make-up test is conducted immediately. Those who fail the make-up test must wait 10 days to schedule the examination again. After the examination, candidates must leave the examination area promptly and must not interfere with the examination.

2

4

Share

Is Engine Oil a Hazardous Substance?

Engine oil is not a hazardous substance. According to the national standard GB6944-2012 "Names and Numbers of Hazardous Goods and Products," common hazardous chemicals are classified into seven categories based on their primary hazardous characteristics: the first category is explosives; the second category is compressed gases and liquefied gases; the third category is flammable liquids; the fourth category is flammable solids, substances liable to spontaneous combustion, and substances emitting flammable gases when wet; the fifth category is oxidizing substances and organic peroxides; the sixth category is toxic substances; and the seventh category is corrosive substances. Engine oil, also known as engine lubricant, is composed of base oil and additives, with base oil being the main component of lubricants. Engine oil is used for lubricating internal combustion engines, with its primary functions being to reduce friction and wear on moving parts, remove sludge and varnish from the engine, neutralize acids produced by fuel and lubricant oxidation, improve piston ring sealing, and cool the engine by carrying away heat from moving parts. The roles of engine oil include: cooling and temperature reduction; sealing and leak prevention; cleaning; shock absorption; lubrication to reduce wear; rust and corrosion prevention; and component protection.

7

2

Share

Is an untransferred car insurance policy equivalent to having no insurance?

An untransferred car insurance policy still counts as having insurance. Introduction to car insurance: Car insurance is a type of property insurance. In the field of property insurance, car insurance is a relatively young category, as it emerged and developed alongside the appearance and popularization of automobiles. Unlike modern motor vehicle insurance, early car insurance primarily focused on third-party liability coverage and gradually expanded to include risks such as collision damage to the vehicle body. Introduction to commercial car insurance: The main types of commercial insurance include vehicle loss insurance, third-party liability insurance, passenger liability insurance, and comprehensive theft insurance. Motor vehicle loss insurance covers the insured vehicle against natural disasters or accidents within the scope of the policy, resulting in loss or damage to the insured vehicle, for which the insurer compensates according to the terms of the insurance contract.

18

4

Share

When Does a Car Air Conditioner Need Refrigerant Recharge?

What is the optimal number of hours for driving practice per day?

Do new cars need an oil change in winter?

Is It Normal for the Oil Dipstick to Reach the Lower Limit at 5,000 Kilometers?

How many hours can I practice for Subject 2 each day?

Is Engine Oil a Hazardous Substance?

Is an untransferred car insurance policy equivalent to having no insurance?

Do I Need a Driver's License to Ride an Electric Motorcycle?

Is Using Hands-Free Calling While Driving Considered a Traffic Violation?

Why is water dripping from the back of the car?

Can a Tiptronic Transmission Shift Directly from 3rd Gear Back to D?