It would be nice if you add chemically synthesized oil if it is high performance · high quality, but it is not only good things. Chemically synthesized oil is one of the biggest bottlenecks in that price, but there are cases that mineral oil is better than that. For example, classical cars and older cars do not support chemically synthesized oils, so there are cases in which engine trouble is caused instead. Engine oil circulates inside the engine and has the role of keeping the condition of the engine, but chemical synthetic oil and the like excellent in heat resistance are in a situation to ride a car for a long time and a situation to ride a car in an environment where a high load is placed on the engine Otherwise it will be meaningless. Depending on the model, you may have specified "genuine mineral oil" in the instruction manual, so it is best to use the oil that best matches the riding car. When choosing oil, it is of course also base oils, but consider the "climate of the place where you live" and the environment where you ride a car, so let's also care about "the viscosity of the oil".