SAE 30 vs 10W30

Viscosity:

• SAE 30: Single-grade oil with a consistent viscosity at operating temperatures, typically used in warmer climates or for specific applications requiring a constant viscosity.
• 10W-30: Multi-grade oil with a lower viscosity at cold temperatures (indicated by the "10W") and a higher viscosity at operating temperatures. Offers better cold-weather performance and flexibility in varying temperatures.

Temperature Performance:

• SAE 30: Suitable for warmer climates as it does not provide optimal performance in cold temperatures. Lacks the flexibility to perform well in cold starts.
• 10W-30: Better for a range of temperatures, including cooler conditions, due to its lower cold-temperature viscosity. Provides better performance during cold starts and in varying weather conditions.

Engine Suitability:

• SAE 30: Often used in older engines or specific applications like small engines (e.g., lawn mowers) where the oil is intended to operate at a stable temperature.
• 10W-30: Commonly used in a wide variety of vehicles, including modern engines, due to its versatility and ability to perform well in both hot and cold conditions.

Summary:

• SAE 30: Best suited for warmer climates and applications where consistent viscosity is needed at operating temperatures.
• 10W-30: Provides better overall performance and protection across a wider range of temperatures, making it more versatile and suitable for modern vehicles and varying conditions.