Castrol Engine oils 5W-30 – 5W-40
Both Castrol 5W-30 and 5W-40 engine oils are multigrade oils designed to perform across a wide temperature range. The primary difference lies in their thickness at high temperatures, which affects engine protection, performance, and fuel economy. The best choice for your vehicle depends on your car’s engine specifications, your driving habits, and climate.
5W-30 vs. 5W-40: Head-to-head comparison
| Feature | Castrol 5W-30 | Castrol 5W-40 |
|---|---|---|
| High-temperature viscosity | Thinner at high temperatures. | Thicker at high temperatures, providing a more stable oil film and stronger protection under heavy loads. |
| Fuel economy | Better fuel efficiency due to its lower viscosity and reduced engine drag. | Slightly lower fuel economy because its higher viscosity creates more engine friction. |
| Engine protection | Optimized for modern engines with tighter tolerances, offering superior protection against sludge and wear. | Provides a more robust oil film under intense heat and pressure, making it ideal for high-performance, turbocharged, or older engines. |
| Best suited for | Newer vehicles, urban driving, and colder climates. Often recommended for Japanese, Korean, and American vehicles. | High-performance and older vehicles, high-temperature climates, and heavy-duty driving. Often specified for European cars, such as those from BMW, Volkswagen, and Mercedes-Benz. |
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