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What is the grade of Shell Helix 10w40 oil?

2 Answers

DiRachel

07/29/25 6:50am

Shell Helix 10w40 oil is a type of Shell Helix brand oil, belonging to mineral base oil. There are two types of Shell Helix oil: one is HX6, which is SM grade, and the other is HX5, which is SL grade and is a mineral oil. Below is some information about engine oil: 1. Introduction to engine oil: Engine lubricating oil, known as the blood of a car, serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and absorb shocks. 2. Composition of engine oil: It consists of base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, giving it new properties and making it an important part of the lubricating oil.

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DiDaniella

08/12/25 10:12am

I've worked in the auto industry for over a decade and frequently deal with oil-related issues. The 10W-40 grade of Shell Helix refers to its viscosity rating. The 10W indicates winter low-temperature fluidity, ensuring smooth flow at -25°C to reduce cold-start wear. The 40 represents high-temperature viscosity, maintaining stable oil film during high engine temperatures to protect pistons and bearings. This isn't the API service classification - Shell Helix 10W-40 typically carries API SN or SN Plus certification for gasoline engines, providing oxidation resistance and deposit protection. Under API SN standards, engine oil emphasizes cleanliness and fuel efficiency, making it suitable for modern vehicles. Always consult your owner's manual when selecting oil. Older vehicles or those frequently driven at highway speeds benefit from higher viscosity oils to extend engine life and prevent premature wear. Regular 5,000 km oil changes are crucial - never skimp by using inferior oil, as engine repairs from poor lubrication will cost far more.

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