Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

What is the Difference Between 30 and 40 Oil Viscosity?

1 Answers

LoganLynn

07/30/25 5:21am

The differences between 30 and 40 oil viscosity are as follows: 1. Viscosity: 40-grade oil has higher viscosity than 30-grade oil. 2. Applicable temperature: 40-grade oil is suitable for higher maximum temperatures compared to 30-grade oil. 3. Fluidity: 30-grade oil has better fluidity than 40-grade oil, which helps reduce fuel consumption and dissipate engine heat faster. 4. Stability: 40-grade oil offers better oil stability under extremely high engine temperatures compared to 30-grade oil. Here is more relevant information: 1. Oil viscosity rating: The numbers indicate viscosity specifications. For example, in "15W-40," the "W" stands for Winter. The smaller the number before "W," the better the oil's low-temperature fluidity, meaning it can be used in lower environmental temperatures and provides better engine protection during cold starts. 2. Letter representation: Oil grades are represented by a combination of two letters. The "S" series represents oil for gasoline engines, with specifications ranging from SA to SN (in alphabetical order, excluding SI). Each subsequent letter indicates improved oil performance, with more additives to protect the engine.

Was this review help?

6

2

Share

More Forum Discussions

What does AVG mean on the Sylphy dashboard?

AVG on the Sylphy dashboard refers to the average fuel consumption. Taking the 2021 Sylphy as an example, its body dimensions are: length 4631mm, width 1760mm, height 1503mm, wheelbase 2700mm, minimum ground clearance 166mm, fuel tank capacity 50l, and the body structure is a 4-door 5-seater sedan. The 2021 Sylphy is equipped with a 1.6l naturally aspirated engine, with a maximum power of 90kw and a maximum torque of 155nm, paired with a 5-speed manual transmission. The front suspension type is MacPherson independent suspension, and the rear suspension type is torsion beam non-independent suspension.

How many cylinders does the new Fit engine have?

New Fit engine is a four-cylinder. What are the characteristics of Fit engine: The Fit 1.3L is equipped with an I-DSI engine featuring a four-cylinder eight-valve, single overhead camshaft design. Its valve rocker arms must be positioned directly above the cylinders, which determines that the spark plugs cannot be placed in the center of the cylinders, reducing ignition efficiency. In this case, this engine adopts a dual-spark-plug structural design to enhance ignition efficiency while ensuring more complete combustion, thereby improving fuel economy. How to protect the engine: Use high-quality engine oil, use qualified coolant (antifreeze), regularly clean the radiator scale, periodically remove carbon deposits from the car, replace the three filters on time, and maintain a reasonable engine speed.

What is Commercial Auto Insurance?

Commercial auto insurance includes Vehicle Damage Insurance, Third-Party Liability Insurance, and Theft Insurance. Below are detailed explanations of commercial auto insurance: 1. Vehicle Damage Insurance: This covers damage to the vehicle caused by natural disasters or accidents within the insurance coverage. 2. Third-Party Liability Insurance: This covers direct property damage and personal injuries to third parties caused by the driver's accidents. 3. Theft Insurance: The insurance liability under Comprehensive Auto Theft Insurance covers vehicle loss due to theft, robbery, or hijacking, as well as reasonable repair costs for damages incurred during theft, robbery, or hijacking, or the loss of vehicle parts and accessories.

Can the car start with the hood open?

It can start normally, but there is a certain degree of danger. Cooling the engine and removing dust completely: First, park the car in an open and shady location, turn off the engine and all electrical equipment, and wait for the engine to cool down. Then, remove the decorative panel of the engine and use a soft brush to clean the floating dust in the engine compartment. If dust remains after cleaning, you can use an air nozzle to blow it away. Starting the car for cleaning and wiping: Spray professional foam cleaner on areas with excessive grease, but be careful not to spray it on wire connectors or fluid inlets in the engine compartment. Ensure the engine is idling during cleaning. Once the foam cleaner has coated the dirt, simply wipe gently with a damp towel, and the engine compartment will be clean.

Is the driver's license date the date after passing Subject 4?

No, after all the applicant's materials meet the requirements and the Subject 3 test is passed, the motor vehicle driver's license file number is determined within 1 working day, and the motor vehicle driver's license is produced and issued. To be precise, the day after passing the Subject 3 test is the initial license issuance date. Below is how to check the initial license issuance date: You can directly calculate it based on the expiration time, and there is an "Initial License Issuance Date" on the driver's license booklet. At the end of the main copy, there is a "Driver's License Validity Period," both of which are clearly listed. License renewal should be processed according to the above validity period, and the annual review can be calculated based on the initial license issuance date.

What does Fit GK5 mean?

Fit GK5 is another name for the regular Fit model. Taking the 2021 Fit as an example, its body dimensions are: length 4109mm, width 1694mm, height 1537mm, with a wheelbase of 2530mm, a fuel tank capacity of 40 liters, and a body structure of a 5-door, 5-seat hatchback. The 2021 Fit is equipped with a 1.5L naturally aspirated engine, delivering a maximum power of 96kW and a maximum torque of 155Nm, paired with a CVT continuously variable transmission. It features a MacPherson strut front suspension and a torsion beam rear suspension.

Trending Ranking

How to set up the horn sound when locking the Levin?

Is running a red light photographed from the opposite side or the rear?

How many times can you participate in the 12123 license plate lottery?

Symptoms of a Dead Car Battery?

What is the difference between gear oil 75w90 and 80w90?

How to Distinguish Between China IV and China V Vehicle Standards?

What is the passing score for the driving test?

What to Do If a Keyless Start Car Runs Out of Battery?

Is Tire Bulging a Quality Issue?

What do MT, AT, and CVT mean in transmissions?

More Forum Discussions

Differences Between Joint Venture and Imported Vehicles

Why Does Car Glass Fog Up?

Can I drive with an expired driver's license for one day?

Can I Check Traffic Violations with Only the Vehicle License?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.