What to Do When Car Temperature is Low in Winter?

Should I Use 92 or 95 Octane Gasoline for My Car?

The octane rating of gasoline for a car should be based on the recommendations in the vehicle's official owner's manual. In addition to checking the appropriate gasoline grade in the owner's manual, it can also be found on the fuel tank cap. Typically, the gasoline grade can also be determined by the engine's compression ratio. Cars with an engine compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. If the compression ratio is higher, 98 octane gasoline is recommended. However, with the use of new technologies, the gasoline grade cannot be solely determined by the compression ratio. A high compression ratio can also be tuned to use lower octane gasoline, as factors like ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the octane rating, the higher the octane number and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. For a 2007 Passat, occasionally using the wrong gasoline grade only requires switching back to the correct grade after use. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended to use lower octane gasoline, using higher octane gasoline will not cause damage, but the increase in octane number can change the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles recommended to use higher octane gasoline, using lower octane gasoline can cause engine knocking. The significantly lower octane number lowers the fuel's ignition point, causing premature ignition during the compression stroke. If the fuel ignites before the spark plug fires, resistance occurs during the upward stroke. This resistance makes the engine run very unstably. If the knocking is mild, it may only increase noise without significant engine damage. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring.

4

5

Share

What Are the General Length and Width Dimensions of Car Seat Cushions?

Car seat cushion dimensions: Front seat backrest: Height 60CM × Width 52CM, Front seat cushion: Height 52CM × Width 50CM, Rear seat backrest: Height 60CM × Width 52CM, Rear seat cushion: Length 132CM × Width 49CM. Providing a comfortable seating experience: Correct posture and good seating comfort are essential prerequisites for safe driving and effective means to alleviate driving fatigue. Installing a suitable seat cover or laying a cushion can significantly improve seating comfort and enhance overall comfort. Protecting the seats: The fabric of most car seats is stitched and cannot be removed for washing. Once stained, even professional interior cleaning at car detailing shops may struggle to thoroughly clean the seats. Therefore, installing seat covers or laying cushions becomes the most convenient way to protect the seats.

11

5

Share

Should the Recirculation Mode Be Turned On When Using the Heater?

Turning on the recirculation mode when using the heater helps prevent the dissipation of warm air and reduces heat loss. The fresh air mode, on the other hand, draws air from outside the vehicle into the cabin, meaning the air coming out of the vents originates from outside, creating a connected environment between the inside and outside of the vehicle. In contrast, the recirculation mode isolates the car's interior from the outside, and the air blown from the vents is recirculated within the cabin. Recirculation Mode: As the name suggests, it circulates the air inside the vehicle with doors and windows closed, heating only the recirculated cabin air. This results in faster heating and improved fuel efficiency. Fresh Air Mode: This mode draws outside air into the cabin while expelling interior air, maintaining fresh air inside the vehicle. In winter, when outside temperatures are low, using the fresh air mode continuously introduces cold air, hindering the cabin's ability to warm up.

3

1

Share

What Do Dashboard Symbols Mean?

Car dashboard symbols represent the following: Oil Can: The oil can symbol represents the fuel gauge. Exclamation Mark: The SET symbol with an exclamation mark indicates abnormal tire pressure. WiFi Symbol: The WiFi symbol represents the reverse radar. Engine Icon: The engine icon indicates an engine malfunction. ESP Symbol: The ESP symbol represents the activation and deactivation of the vehicle's stability control system. Battery Symbol: The battery symbol indicates the working status of the battery. Car Door Symbol: The car door symbol indicates that a door is open or not properly closed.

12

1

Share

What Can You Do with Leftover Engine Oil from Maintenance?

Leftover engine oil from maintenance can be used during the next service. Engine oil is something every car owner encounters during vehicle use. It is often referred to as the 'blood' of the engine, as the engine cannot function properly without it. Functions of Engine Oil: Engine oil lubricates and reduces friction, aids in cooling, provides sealing to prevent leaks, protects against rust and corrosion, and acts as a shock absorber. It is hailed as the 'lifeblood' of a car. Choosing the right oil and changing it regularly helps maintain the engine in good condition and extends its lifespan. Choosing Engine Oil: Selecting engine oil isn't about choosing the most expensive option but rather finding the right oil based on your car's engine characteristics and driving habits. It's best to categorize oil by its suitability for winter or summer use. For winter, prioritize low-temperature viscosity grades, while in summer, when temperatures are higher, oils with better low-temperature viscosity grades aren't necessary.

6

3

Share

Can the Amount on Used Car Transaction Invoice Be Written Randomly?

Used car invoice amounts cannot be written randomly. According to national regulations, the transaction amount on used car invoices and other data on the invoice are issued by the tax bureau. The used car sales invoice serves as proof of the vehicle's origin and is an important document for handling the transfer registration procedures. Therefore, it is also referred to as the "transfer invoice". Precautions for used car transactions: Purchase a used car with complete documentation; secondly, check if the vehicle has any traffic violation records. If there are any, it is best to have the original owner clear the violations before purchasing; thirdly, verify whether the vehicle has been involved in any accidents or if it is a modified car; fourthly, check the vehicle identification number. Establish a written contract: Before transferring ownership, it is essential to establish a formal, legal, and authentic written car transaction contract as legal proof of the transaction, confirming that the transaction has been successfully completed.

12

5

Share

What to Do When Car Temperature is Low in Winter?

Should I Use 92 or 95 Octane Gasoline for My Car?

What Are the General Length and Width Dimensions of Car Seat Cushions?

Should the Recirculation Mode Be Turned On When Using the Heater?

What Do Dashboard Symbols Mean?

What Can You Do with Leftover Engine Oil from Maintenance?

Can the Amount on Used Car Transaction Invoice Be Written Randomly?

Reasons for the Buzzing Noise When the Mazda3 is Running

What are the causes of abnormal noises in the Envision?

What is the Mazda3 Axela Bright Selection Package?

Where Does the Air for the Car Air Conditioning Enter the Vehicle?