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UNISOL THUNDERSTORM 4T 15W-50 engine oil meets and exceeds the latest API-SM and is suitable for all types of four-stroke engines operation under the most extreme and varied conditions, such as high temperature stop-start driving around town. Recommended for Cruiser Bikes and street bikes of all leading OEM’s recommending 15W-50 grade engine oil. •MEETS API SM/JASO MA2