Yamalube Sporty Premium 10W40 engine oil is a fully synthetic lubricant designed for optimal performance and engine longevity in Yamaha motorcycles. It offers improved wear, sludge deposits, and oxidation control, while also featuring a reduced evaporation rate for efficient usage. This oil is specifically recommended for YAMAHA bikes
Here's a more detailed breakdown: 
Fully Synthetic:
This signifies a high-quality oil with superior performance characteristics compared to mineral or semi-synthetic options.
10W40 Viscosity:
This grade indicates the oil's flow characteristics at different temperatures. 10W40 is a common and versatile grade suitable for a wide range of temperatures.
Improved Engine Performance:
The oil's formulation helps optimize engine performance by minimizing wear, reducing sludge buildup, and controlling oxidation.
Reduced Evaporation:
This feature helps ensure efficient and consistent lubrication, even under high-temperature conditions, contributing to longer engine life.
JASO MA and API SL:
These are industry standards that the oil meets, indicating its suitability for 4-stroke motorcycles and its performance level.