5W-40 Engine Oils
Explore our versatile 5W-40 full synthetic engine oils, engineered for outstanding protection and performance in a wide range of modern petrol and diesel engines.
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Eiffel synthetic oils offer superior protection with advanced formulations that provide better engine cleanliness, longer drain intervals, and enhanced performance in extreme temperatures compared to conventional oils.
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A Guide to 5W-40 Engine Oils
5W-40 engine oil is a high-performance lubricant favored for its versatility and robustness. It provides a higher level of protection than a 5W-30 oil, particularly in demanding conditions. This makes it the oil of choice for many modern European cars, high-performance vehicles, and light-duty diesel engines. Eiffel Lubricants offers premium full synthetic 5W-40 oils engineered for these exact applications.
What Do the Numbers in 5W-40 Actually Mean?
The code ""5W-40"" is a viscosity rating from the Society of Automotive Engineers (SAE). It tells you how the oil behaves at both low and high temperatures.
- 5W: The 'W' stands for 'Winter'. The number 5 indicates the oil has excellent fluidity at low temperatures. This ensures it can flow quickly to protect critical engine parts during a cold start, just like a 5W-30 oil.
- 40: This number represents the oil's viscosity at the engine's normal operating temperature. A 40-grade oil is thicker and more resistant to thinning under heat than a 30-grade oil. This provides a stronger, more durable protective film when the engine is working hard.
What Kind of Cars Use 5W-40 Engine Oil?
5W-40's robust nature makes it ideal for engines that generate more heat or operate under higher stress. It is very commonly specified for:
- Modern European Vehicles: Many cars from manufacturers like Volkswagen, Audi, BMW, Mercedes-Benz, and Porsche require a 5W-40 oil that meets specific European standards (like ACEA).
- High-Performance and Turbocharged Engines: The increased heat from turbochargers and high-revving engines requires a stronger oil film to prevent wear. 5W-40 is designed to provide this extra protection.
- Light-Duty Diesel Engines: It is a popular choice for many diesel-powered SUVs and utes, where its stability and cleaning properties help to manage the soot and high temperatures common in these engines.
The Key Benefits of a Full Synthetic 5W-40 Oil
Using a premium 5W-40 oil provides peace of mind that your engine is getting the protection it needs to perform at its best.
- Designed for High-Temperature Protection: The primary benefit is its ability to maintain a strong protective film when the engine gets hot. This is crucial during high-speed driving, towing, or in hot Australian climates.
- Helps to Maintain Engine Performance: A quality full synthetic 5W-40 is engineered to resist shearing and viscosity loss, which helps to ensure your engine performs consistently from one oil change to the next.
- Contributes to Excellent Engine Cleanliness: Our 5W-40 oils are formulated with advanced detergents designed to prevent sludge and carbon deposits, which is especially important for direct-injection and diesel engines.
Always consult your vehicle's owner's manual for manufacturer-specific recommendations.