There are various types of motorbike oil, riders can choose oil according to their needs. This experiment aims to find out which oil is suitable for use by a 125 cc engine at different air temperatures according to the driver's needs. This experiment will analyze the reduction in oil viscosity values with brands of oil A, oil B and oil C. The mileage used is 20 km, 40 km and 60 km with air temperatures of 33-36°C and 28-30°C. The viscosity value was measured using a Brookfield viscometer. Based on the results of the tested data, the percentage reduction in viscosity value at an air temperature of 33-36°C with a distance of 60 km is Oil A 26%, Oil B 62%, and Oil C 19%, therefore Oil C is better used in areas with a temperature of 33-36°C because it does not experience a significant decrease in viscosity. The percentage reduction in viscosity value at an air temperature of 28-30°C with a distance of 60 km is oil A 11%, oil B 62%, and oil C 62%, so oil A is better used in areas with a temperature of 28-30°C.
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