Why do the specs for the BMS Tomahawk 400 list 15W40SG as engine oil and 10W40 as lubrication oil?

The BMS Tomahawk 400 specifies 15W40SG as engine oil because it provides the necessary viscosity and protection for engine components under various operating conditions, particularly in warmer climates. Meanwhile, 10W40 is listed as lubrication oil, likely due to its ability to offer better flow at lower temperatures, making it suitable for different lubrication needs within the engine and its components. This differentiation ensures optimal performance and longevity of the engine by using the right oil for specific functions.