5W30 vs 5W40

Viscosity:

• 5W-30: Thinner at high temperatures. Better for fuel economy and newer, smaller engines.
• 5W-40: Thicker at high temperatures. Better for high-performance or older engines.

Temperature Performance:

• 5W-30: Ideal for colder climates, offers better fuel efficiency.
• 5W-40: Suitable for hotter climates, provides better protection under heavy loads.

Engine Suitability:

• 5W-30: Recommended for modern engines, enhances fuel economy.
• 5W-40: Better for engines under high stress or older engines.

Manufacturer Recommendations:

Always follow the vehicle manufacturer's recommended oil type for optimal performance and warranty compliance.

Summary:

• Use 5W-30 if you drive in cold climates, prioritize fuel economy, or if it's manufacturer-recommended.
• Use 5W-40 if you drive in hot climates, have a high-performance or older engine, or need extra protection.