5W30 vs 10W40

Viscosity:

• 5W-30: Thinner at cold temperatures and operating temperatures. Provides better fuel efficiency and lower friction.
• 10W-40: Thicker at operating temperatures. Offers more protection under high stress and high temperatures.

Temperature Performance:

• 5W-30: Better for cold weather as it flows more easily during cold starts. Suitable for moderate to cooler climates.
• 10W-40: Better for high temperatures and hot climates. Provides better protection in extreme conditions and under heavy loads.

Engine Suitability:

• 5W-30: Often recommended for newer engines, prioritizing fuel efficiency and lower viscosity for better performance.
• 10W-40: Suitable for older engines, high-performance engines, or those operating under heavy loads or in hot climates.

Summary:

• 5W-30: Ideal for moderate climates and for engines that require better fuel efficiency and performance in cooler temperatures.
• 10W-40: Better for high-temperature conditions and engines that experience more stress or operate under heavy loads.