Which engine oil covers the largest range of temperatures?

SAE 10 W 40 oil is designed to perform effectively across a wide temperature range. The "W" stands for winter, indicating its suitability for cold starts, while the numbers suggest its viscosity at both low and high temperatures. This ability to operate efficiently in varying climates makes it a versatile choice for vehicle maintenance, which is important according to German regulations that emphasize the need for proper vehicle maintenance to ensure safety and environmental compliance.

SAE 30 and SAE 10 W 30 oils have narrower operational temperature ranges, making them less suitable for extreme conditions. Understanding the differences in engine oils helps ensure that vehicles run smoothly, which is a key component of adherence to German traffic laws concerning vehicle maintenance.