Original Yamalube Semi-Synthetic 10W30 Engine Oil 4S, Available in 1 Liter, 4 Liter, 60 Liter and 208 Liter. Fits all 4-stroke engines from 2.5 to 350 HP. If your engine is still factory warranty, it is extremely important to use this oil as the warranty expires using non-original oil. This oil is also suitable for all other modern 4-stroke engines.