Is it better to use 5W30 or 5W40 engine oil for Focus?

1 Answers
MacDelilah
07/30/25 6:46am
It is better to use 5W30 engine oil for Focus. It is essential to use engine oil with the appropriate quality grade, which is the key to ensuring the normal operation of the engine. The following are the relevant introductions: 1. Engine oil grade: The engine oil grade usually indicates viscosity and quality. The viscosity of lubricating oil is mostly marked with SAE grade, and SAE is the abbreviation of "Society of Automotive Engineers" in English. 2. Meaning of 5W30: In the engine oil 5W30, "5" indicates the low-temperature fluidity of the engine oil. The smaller the number, the lower the ambient temperature that can be used; the better the protection ability for the engine during cold starts. 5 represents resistance to external low temperatures of -30°C; 30 represents the standard kinematic viscosity at 100 degrees Celsius is 30. This number indicates the high-temperature resistance index of the engine oil. The larger the number, the better the protection performance of the engine oil at high temperatures.
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