When purchasing engine oil, hydraulic fluid, or gear oil, the most common term you encounter is the "Viscosity Grade," which refers to the thickness or fluidity of the oil at different temperatures. However, viscosity follows multiple international standards.

Common Standards You Should Know:

1. SAE (Society of Automotive Engineers) – Commonly used for automotive engine and gear oils (e.g., 15W-40, 75W-90).
- Number before W = Cold start viscosity (W = Winter).
- Number after W = Operating temperature viscosity.

2. ISO VG (International Standards Organization Viscosity Grade) – Used for industrial applications like hydraulic and machinery lubricants (e.g., ISO VG 32, 68, 150). The number indicates viscosity at 40°C.

3. AGMA (American Gear Manufacturers Association) – Often used for industrial gear oils (e.g., AGMA 4, AGMA 7), which can be cross-referenced with ISO VG values.

How to Choose the Right One?

Identify your equipment type. Vehicles use SAE, while industrial machinery uses ISO VG or AGMA. Crucially, consider your specific operating environment—actual temperature, load, and surroundings. Oil that is too thick causes friction; oil that is too thin provides insufficient protection.

Shell offers a full range of products meeting all these standards. Our technical team is ready to help you choose the correct viscosity for your needs.

CTA: Not sure which grade to use? Contact us today for a free technical consultation.