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What is the difference between the letters in diesel and gasoline universal engine oil?

1 Answers
VanLydia
07/30/25 4:23am
Quality grades, also known as API ratings, are generally marked on the left or right side of the viscosity value. When both "S" and "C" letters are marked, it indicates that the oil is suitable for both gasoline and diesel engines. Below is an introduction to diesel engine oil: 1. The "S" series represents oil for gasoline engines, with specifications including SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN; 2. The "C" series represents oil for diesel engines, with specifications including CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4; 3. When both "S" and "C" letters are present, it means the oil is a universal type for both gasoline and diesel engines.
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More Forum Discussions

What type of fuel should a Ford Raptor use?

Ford Raptor should use 92-octane gasoline, as this fuel grade is recommended in the vehicle's official owner's manual. In addition to checking the appropriate fuel grade in the owner's manual, Ford Raptor owners can also find this information on the fuel tank cap, which is usually labeled. Typically, the fuel grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a ratio between 10.0-11.5 should use 95-octane gasoline. For higher compression ratios, 98-octane gasoline is recommended. However, with the application of new technologies, the fuel grade cannot be solely determined by the compression ratio. High compression ratio engines can also be tuned to use lower-octane fuel due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Generally, the higher the fuel grade, the higher the octane rating 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. If a Ford Raptor is occasionally filled with the wrong fuel grade, simply switching back to the correct grade after use is sufficient. However, long-term use of the wrong fuel grade can have the following effects: For vehicles recommended to use lower-octane fuel, using higher-octane fuel will not cause damage, but the increased octane rating can alter 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 fuel, using lower-octane fuel can cause engine knocking. Due to the significantly lower octane rating, the fuel's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance will develop during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring in extreme cases.
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What is the penalty for a car's annual inspection being overdue by 1 year?

If a car's annual inspection is overdue by 1 year, the penalty is a fine of 200 yuan and 3 demerit points. According to regulations, the annual inspection should be applied for 90 days in advance, approximately within 3 months before the due date. Additionally, all traffic violations related to the vehicle must be resolved before the inspection. Any delay beyond the valid inspection period is considered overdue, resulting in a penalty of 3 demerit points and a 200 yuan fine. Relevant notes about vehicles that have not undergone annual inspection: 1. For any traffic accidents caused by a vehicle that has not undergone the annual inspection on time, the driver will bear full or primary responsibility, and the insurance company will not be liable. Since the insurance policy specifies that vehicles with expired inspections are excluded from coverage, if an accident occurs with such a vehicle, all responsibility falls on the driver, and the insurance company has the right to refuse compensation. 2. According to traffic laws, vehicles without a valid inspection are not permitted on the road. If such a vehicle is found on the road, the driver will be penalized with 3 demerit points and a 200 yuan fine. 3. Driving a vehicle that has not passed the annual inspection may lead to the vehicle being impounded and fined if caught during a traffic check. If you realize that your vehicle's inspection is overdue, the first step is to stop driving it and proceed with the inspection process as soon as possible.
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What does an exclamation mark in a circle represent?

Red exclamation mark (specifically styled as an exclamation mark inside a circled bracket) represents a warning for the braking system, mainly indicating a brake system malfunction or low brake fluid level. Solution: Immediate inspection and repair of the braking system is required to avoid accidents. Apart from the red exclamation mark indicating brake system failure, all other exclamation marks on a car are yellow, representing general faults, automatic transmission faults, abnormal tire pressure, and lighting faults. Below is a detailed analysis of these four scenarios: General Fault: An exclamation mark inside a triangle. If this symbol lights up, it indicates a fault in the car's general performance or components and functions. Common issues include parking sensor failure, fuel cutoff system intervention or malfunction, external light failure, engine oil pressure sensor failure, etc. A visit to a 4S shop is necessary to inspect and identify the source of the fault. Automatic Transmission Fault: A yellow gear with an exclamation mark inside. This is the automatic transmission fault warning light, indicating a transmission fault or transmission lubricant level below the normal range. Transmission fluid should be replaced promptly. Abnormal Tire Pressure: An exclamation mark with a horizontal line below a bracket. This represents the tire pressure monitoring warning light, which illuminates when the car's tire pressure is too low. Check the tire pressure and restore it to the normal range. Lighting Fault: A yellow bulb with an exclamation mark. This is the lighting fault indicator, signaling a fault in the car's lights. Solution: Visit a 4S shop as soon as possible for inspection and repair, or perform a self-check focusing on commonly used bulbs such as turn signals, fog lights, and interior lighting to identify the issue.
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What is the actual fuel consumption of the RAV4 2.0L?

The comprehensive fuel consumption of the RAV4 2.0L is 5.8-6.4L/100km. There are currently 7 models of the RAV4 2.0L on sale. The fuel consumption of the front-wheel-drive Urban Edition is 5.8L/100km. The front-wheel-drive Fashion Edition, front-wheel-drive Premium Edition, and front-wheel-drive Fashion PLUS Edition have a fuel consumption of 5.9L/100km. The all-wheel-drive Fashion Edition and all-wheel-drive Fashion PLUS Edition have a fuel consumption of 6.3L/100km. The all-wheel-drive Premium Edition has a fuel consumption of 6.4L/100km. The above figures are NEDC comprehensive fuel consumption, which is the fuel consumption data measured under the NEDC test procedure. The actual fuel consumption is higher than this value, ranging from 7.5-9.0L/100km. When driving, the following 5 tips can help reduce fuel consumption: When starting the vehicle, use a low gear, gently press the accelerator, and gradually increase speed. Avoid suddenly pressing the accelerator hard, as this can multiply fuel consumption. Light acceleration, light braking, and early braking: While driving, gently press the accelerator to avoid sudden increases in engine RPM and prevent the car from shaking during operation, making the car more fuel-efficient. By anticipating road conditions and applying slow, uniform acceleration or braking, fuel economy can be improved by up to 20%. Maintain proper tire pressure: Keep tire pressure at the level recommended by the manufacturer. For every 2 PSI below the recommended value (approximately 0.2 in metric units relative to the standard pressure of 2.4), fuel consumption increases by 1%. Regular vehicle maintenance or inspection: Regular oil changes can reduce carbon buildup (carbon buildup can cause poor ignition, sluggish acceleration, increased fuel consumption, and in severe cases, even cylinder misfires). Regularly check and replace the air filter if dirty, and clean or replace the fuel injectors, spark plugs, and throttle body as per the mileage. Close the windows while driving. Driving with windows open increases wind resistance, which in turn increases the resistance the car faces, requiring more power and thus increasing fuel consumption.
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How to Eliminate the Engine Warning Light on the Great Wall Pao?

If the engine warning light is on, you can follow these steps: First, check if the engine is running normally, whether there is shaking, black smoke, or difficulty starting. If any of these issues are present, try not to start the engine again. Especially note that if the red light is on, do not start the engine at all. If the engine is running normally and the vehicle can be driven, please go to a service station as soon as possible to find out the cause. The service station only needs to connect a portable diagnostic device to easily read the fault code, obtain fault information, and carry out targeted repairs. If the engine is running normally, the owner can also try gently plugging in various wiring harness connectors, as it may be caused by a loose connection somewhere, or repeatedly turning the key to the ON position to see if the light can be eliminated. Generally, the reasons for the engine warning light being on mainly include the following seven: Sensor failure: The sensors mentioned here include water temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or the signal is interrupted, the vehicle's ECU cannot accurately obtain engine data, which will cause the engine warning light to come on. Fuel quality issue: If fuel and oil are not added as required by the manufacturer, it may cause engine wear, leading to the warning light coming on. Poor mixture combustion: Poor mixture combustion can cause engine carbon deposits or knocking. When monitored by the oxygen sensor and reported to the ECU, the warning light will come on as a warning. Spark plug failure, ignition coil failure, fuel pump failure, fuel line blockage, etc., can all cause poor mixture combustion in the engine. Turbocharging issue: The intake turbocharging pipeline and turbocharger can also cause the engine warning light to come on. The most common is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, power loss, metal noise, and blue or black smoke from the exhaust pipe. Intake issue: If there is a problem with the car's intake, it may cause engine pipeline blockage, and in severe cases, the engine warning light will come on. If the air filter is not clean and not cleaned regularly, it can lead to intake problems. Exhaust issue: Exhaust faults can also cause the engine warning light to come on. The rear oxygen sensor, three-way catalytic converter, exhaust camshaft, and bearing faults are all causes of exhaust problems, with the three-way catalytic converter being the most common. Using leaded gasoline, lead or silicon-containing lubricant additives, physical damage to the three-way catalytic converter, or engine fuel supply system failures can easily cause three-way catalytic converter faults. Anti-theft system fault: If the car's electronic anti-theft system malfunctions, or if the anti-theft controller does not match the engine electronic controller, the anti-theft system can also cause the engine to not work properly, and the engine warning light will come on.
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