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What are the differences between 20 and 30 engine oils?

1 Answers
MasonFitz
07/29/25 10:23pm
The differences between 20 and 30 engine oils are as follows: 1. Different viscosity: The main difference between 5W-20 and 5W-30 engine oils lies in their high-temperature viscosity. The difference between 5W-20 and 5W-30 is only in the latter number. 5W-20 has lower viscosity (viscosity between 5.6-9.3), which is relatively more fuel-efficient and provides a lighter driving feel, while 5W-30 has higher viscosity (viscosity between 9.3-12.5). 2. Different cold-start performance: The 5W in 5W-30 indicates the cold-start performance of the engine oil. Using engine oil with a lower value before the W makes it easier to start the engine in cold weather. 3. Different upper and lower limit values: The upper and lower limit values for 20 engine oil are 5.6-9.3, while those for 30 engine oil are 9.3-12.5.
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What does it mean to replace the remote key battery?

It means the remote key battery is low and needs to be replaced. Replacement method: Generally, each brand's car key has a mechanical key. After finding the mechanical key, apply slight force at the top of the key to open it. Use a small flat-head screwdriver to gently pry out the old battery, then install the new battery with the correct positive and negative polarity alignment. After installing the battery, reassemble the car key by inserting the mechanical key back into its slot, and the assembly is complete. Precautions for battery replacement: When replacing the key battery, ensure there is no dirt, grease, or other foreign matter on the battery contacts. Batteries have positive and negative terminals; do not reverse them to avoid damaging the remote battery. After replacing the battery, check the key to ensure all functions of the smart key are working properly. Different car keys require different battery models, so it's best to choose the same model battery when purchasing.
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Are there more front-wheel drive or rear-wheel drive cars?

Most family cars are front-wheel drive, while some cheaper cars are rear-wheel drive. The differences between front-wheel drive and rear-wheel drive are as follows: Front-wheel drive cars: The engine of a front-wheel drive car is usually transversely mounted. The transverse engine is installed in front of the front axle, so most of the weight is concentrated in the front of the car. Front-wheel drive cars are more prone to understeer during fast cornering. The interior space of front-wheel drive cars is larger, so these cars offer better comfort. The drive system structure is relatively simple, so the cost of these cars is lower. Rear-wheel drive cars: Most rear-wheel drive cars have longitudinally mounted engines. Installing the engine vertically allows it to be positioned further back, resulting in a more balanced weight distribution between the front and rear of the car. Rear-wheel drive cars offer better handling and faster acceleration. However, the longitudinally mounted engine occupies some interior space, so most rear-wheel drive cars are larger. Rear-wheel drive cars are more prone to oversteer during fast cornering, and they also tend to have more horsepower, as rear-wheel drive cars are less likely to slip during hard acceleration.
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What are the reasons for the sudden failure of the Volvo S90 air conditioning to cool?

Volvo S90 air conditioning suddenly not cooling reasons are as follows: Air conditioning compressor belt is too loose: If you turn on the air conditioning in the car and hear a squeaking sound, it is likely that the air conditioning not cooling is caused by the compressor belt being too loose. Insufficient refrigerant: The common refrigerant code is R134A. The consequence of insufficient refrigerant is that it affects the cooling effect of the air conditioning, leading to insufficient cooling. Generally, the refrigerant is in a relatively closed environment. However, after long-term use of the vehicle, the components in the air conditioning system may age and wear out, causing leaks in the refrigerant space, resulting in insufficient refrigerant. Air conditioning filter is too dirty: If the filter is too dirty, not only will it cause more impurities to be inhaled into the car, which is harmful to health, but the dirt will also block the air conditioning filter, so part of the cold air from the air conditioning will be blocked, making it feel like the air conditioning is not cooling.
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How much engine oil can be added at one time?

How much engine oil can be added at one time depends on the type of engine, with the addition amount ranging from 3.5 to 8 liters. You can check the oil dipstick scale after adding the oil. Here are the details: Oil dipstick scale: There are two marks on the oil dipstick, one is the maximum mark, and the other is the minimum mark. The normal oil level should not be higher than the maximum mark or lower than the minimum mark. The oil level between these two marks is considered normal. Method for checking the oil level: After adding the oil, start the vehicle and then check the oil level 3 minutes after turning off the engine. This is because the oil filter needs to be replaced along with the oil, and the newly replaced oil filter does not contain any oil. After starting the vehicle, the oil will flow into the oil filter. Waiting for 3 minutes after turning off the engine allows the oil to flow back into the oil pan, ensuring a more accurate reading. Remember not to check the oil level on a slope, as the vehicle's tilt will cause the oil in the oil pan to tilt as well, resulting in an inaccurate oil level reading.
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How early can a motor vehicle undergo its annual inspection?

Motor vehicles can undergo their annual inspection up to 3 months in advance. For example, if a vehicle's inspection validity expires in September of this year, then the annual inspection period would be from July 1st to September 30th of this year. There are several ways to check the annual inspection time. The most straightforward method is to check the vehicle registration certificate and the electronic policy for compulsory traffic insurance, which contain the motor vehicle's registration date. The registration month is the month when the motor vehicle's annual inspection is due. Additionally, you can directly observe the annual inspection sticker, which displays the validity period of the inspection. Points to note about annual inspections: Vehicles that fail the annual inspection must be repaired within a specified time limit. If they still fail after the deadline, the vehicle management office will confiscate their license plates and prohibit them from continuing to operate. Vehicles that do not undergo the annual inspection without reason or fail the inspection are not allowed to drive on the road or transfer ownership. Vehicles that meet the scrapping conditions or have exceeded the prescribed service life will not be inspected, and their license plates will be revoked, their files canceled, and they will be scrapped.
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What is the oil specification for the Excelle?

The most commonly used original equipment manufacturer (OEM) oil specification for the Excelle is 5W-30, specifically Mobil 1 full synthetic oil. If you wish to change the oil during later maintenance, you can choose from brands like Mobil, SRS, Shell, and Castrol. The official Excelle manual recommends oil specifications of 5W-20, 5W-30, or 5W-40. The viscosity of engine oil changes with temperature, so it's crucial to pay attention to its performance under both low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity. 5W means it can withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, resulting in smoother cold starts for the vehicle. The second number represents the oil's kinematic viscosity at 100°C. A higher number means the oil can maintain its viscosity index better at high temperatures, which can also be understood as providing better lubrication performance under high-temperature conditions. The method for changing the oil in an Excelle is as follows: Wait for the engine temperature to cool down, allowing the oil to drain back into the oil pan. Use a wrench to loosen the oil drain plug and place an oil pan underneath to catch the old oil until it stops flowing. Start the engine and let it run for about 30 seconds to allow the oil in the main oil passages to drain out. Use a specialized wrench to remove the oil filter. Apply a small amount of new oil to the gasket of the new oil filter and hand-tighten it clockwise. Add the new oil through the oil filler cap on the engine's valve cover. Typically, fill up to three-quarters of the oil bottle. Start the engine and let it run for 5 minutes, checking for any leaks around the oil drain plug and oil filter. If leaks are found, perform necessary repairs. After turning off the engine, pull out the oil dipstick to check that the oil level is within the standard range.
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