Higher viscosity oils are recommended for __________ temperatures.

Higher viscosity oils are recommended for high temperatures because they maintain their lubricating properties better under conditions of heat. As the temperature rises, oils can thin out, which reduces their ability to provide a protective film between moving engine parts. High viscosity oils are formulated to resist thinning and maintain a more consistent thickness, ensuring that components remain lubricated and protected from wear even when the engine operates at elevated temperatures. This characteristic is particularly important in high-performance engines or in situations where heat build-up is common, as it minimizes the risk of damage that can occur from inadequate lubrication.

In contrast, lower viscosity oils are typically suited for cooler temperatures where a thinner oil is advantageous for easier flow during cold starts. Moderate and variable temperatures are best managed with oils that can adapt, but in high-temperature environments, the stability and lubrication provided by higher viscosity oils are crucial for optimal engine performance.