What is the difference between SM grade and SN grade engine oil?

1 Answers
GrahamMarie
07/24/25 10:02pm
The difference between SM grade and SN grade engine oil lies in their capabilities: SM grade oil has excellent oxidation resistance and is more wear-resistant; SN grade oil has stronger cleaning ability and makes vehicle emissions more environmentally friendly. The first letter of the engine oil specification for gasoline engines is "S", while the first letter for diesel engine oil specifications is "C". If the engine oil is labeled "SC", it means this oil is a universal type, suitable for both gasoline and diesel engines. Taking gasoline engines as an example, the grades of engine oil used in gasoline engines, from low to high, are SE, SF, SG, SH, SJ, SL, SM, and SN.
Was this review help?
20
3
Share
More Forum Discussions

How long does it take for traffic violations to appear on 12123?

Traffic violations generally take 3 to 7 days to appear on the 12123 platform. Here are the specific details about 12123: 1. Query time: The 12123 platform is just a service and cannot display violations immediately after they occur. Traffic violations are determined through electronic monitoring. Violations captured by electronic surveillance require manual review, which takes about 72 hours to upload the records. You can usually check them on the 12123 platform within a week at most. 2. 12123 service promotion: Starting from June 1, 2019, the traffic management voice service hotline was promoted. The nationwide unified traffic management service number 12123 has been gradually rolled out, providing services such as traffic management business consultation, information queries, and business processing.
14
1
Share

Why Does Only BMW Use ZF Transmissions?

Because BMW can be considered ZF's largest client, having ordered transmissions from ZF for many years. Most BMW models use ZF transmissions, with only a few front-wheel-drive models using Aisin transmissions. Below is some relevant information: 1. Structure: Structurally, ZF's 8-speed automatic transmission primarily consists of a torque converter, three sets of planetary gear mechanisms, clutch brakes, and a hydraulic control mechanism. The torque converter transmits engine power to the transmission, while the planetary gear mechanisms and clutch brakes are responsible for forming the eight gear ratios. The hydraulic control mechanism manages the clutches and brakes. 2. Transmission Issues: Although ZF's 8HP transmission is one of the top-performing and most reliable 8-speed transmissions available, it comes with a relatively high cost. Additionally, the gear ratio difference between the 1st and 2nd gears is quite significant, and even with the torque converter's buffering effect, slight movements can still be felt.
3
5
Share

Where is the seat ventilation button on the e300?

If the e300 has been retrofitted, the ventilation button is located below the vehicle's center console, adjacent to the seat heating buttons; the rear control buttons are positioned on the corresponding door panels, next to the buttons controlling the electric seat adjustment, and are also aligned with the seat heating buttons. Below is a related introduction to the Mercedes-Benz e300: 1. Exterior: The front fascia design is identical to the imported version, with sharp lines for the split high and low beams, giving an overall youthful and dynamic effect, completely transforming the image of the "old Benz." The LED light cluster below the front bumper further emphasizes its modern appeal. 2. Interior: The dark gray interior appears quite youthful, paired with brown seats, exuding a high-end feel. The focal point on the center console is the large GPS navigation screen, which is impressively large. The middle section houses the audio control buttons, while the lower part contains the air conditioning control buttons.
13
5
Share

Can a Directly Obtained B2 License Be Downgraded?

If a driver accumulates 12 or more penalty points within a scoring cycle, their driver's license will be downgraded. Below are specific details about driver's licenses: 1. Classification: The Ministry of Public Security officially issued the "Motor Vehicle Driver's License Business Work Standards," introducing a tiered system for motor vehicle driver's licenses, categorizing them into 15 levels: A1, A2, A3, B1, B2, C1, C2, C3, C4, D, E, F, M, N, and P. 2. Renewal Regulations: If a motor vehicle driver does not accumulate 12 penalty points in any scoring cycle during the six-year validity period of their driver's license, they can renew it for a ten-year validity period. If they continue to avoid accumulating 12 penalty points in any scoring cycle during the ten-year validity period, they can renew it for a long-term valid driver's license. 3. Contents: A motor vehicle driver's license records the holder's ID number, name, gender, date of birth, permanent address, nationality, permitted (learned) vehicle type code, initial issuance date, validity period, and management records, along with the issuing authority's seal, file number, and the holder's photo. The design of the motor vehicle driver's license is stipulated by the Ministry of Public Security.
7
1
Share

Why can't the steering wheel of a Volkswagen car be turned when it's locked?

The steering wheel of a Volkswagen car may not turn when locked due to the self-locking anti-theft feature of the steering wheel, which is common in most cars. There is a locking groove on the steering shaft and a locking tongue on the bracket. When turned to a certain angle, the locking tongue slides into the groove, locking the steering wheel. Here is additional information: 1. The function of steering wheel lock with one-button start: Steering wheel lock is a simple anti-theft feature. After the car is turned off, turning the steering wheel from the straight position to one direction (usually to the left) by a certain angle will cause a "click" sound, locking the steering wheel. In this locked state, the steering wheel cannot be turned, the key cannot be turned, and the car cannot be started, thus achieving the anti-theft function. 2. One-button start device: The one-button start device is part of a smart car, a button device that simplifies the starting process and can also turn off the engine. This device can be installed at the original key lock position or as an independent panel modification.
10
0
Share

Will points be deducted for not turning off the signal light during a right-angle turn?

For not turning off the turn signal after a right-angle turn in Subject 2 of the driving test, 10 points will be deducted. Below are specific tips for Subject 2 of the driving test: 1. Slow speed: Maintaining a slow speed is the fundamental rule for practicing Subject 2. Ensure the vehicle does not stop while keeping the speed as slow as possible, allowing sufficient time to adjust each operation. 2. Adjust the rearview mirrors: After getting into the car, always adjust the rearview mirrors properly, which is particularly important for reverse parking and parallel parking. 3. Master the three-point alignment method: The three points are the driver's eyes, a reference point on the car, and a reference point on the ground. During Subject 2 operations, it is essential to accurately locate and observe these points to ensure precision. 4. Pay attention to the four corners of the car: The front corner is prone to crossing the outer line during reverse parking, while the rear corner may cross the side lines of the parking space; the front corner may go out of line during curve driving; the front corner may go out of line during a right-angle turn; the front corner may cross the outer line or the left front corner of the parking space during parallel parking, and the right rear corner may cross the right parking space line. Therefore, always be mindful of the four corners and the outer boundary lines.
17
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.