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Audi A4 Oil Viscosity: 30 or 40?

1 Answers

SanMalachi

07/30/25 8:41am

Audi A4 is recommended to use 5W40 fully synthetic engine oil. Meaning of the specifications: The oil specification 5W-40 indicates that W stands for WINTER, meaning it is suitable for winter use. The number 5 before W represents the viscosity at low temperatures. The smaller the number, the better the fluidity at low temperatures and the stronger the cold resistance. 40 refers to the viscosity at 100 degrees Celsius. The larger the number, the higher the viscosity and the better the high-temperature resistance. How to choose the oil specification: Select based on your needs, while also considering factors such as the vehicle's driving environment and the owner's driving habits. If you frequently drive in congested areas or your vehicle is relatively old, you may consider using oil with higher viscosity to better protect the engine. Naturally aspirated engines have lower requirements for oil performance and can use mineral oil or semi-synthetic oil. Turbocharged engines, compared to naturally aspirated ones, are more precise and operate under harsher conditions, requiring higher-performance oil with better fluidity. Fully synthetic oil is the best choice.

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