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CJ-4 15W-40 Diesel Engine Oil Goes the Distance 

Five buses complete road test of nearly 50,000km (30,000 miles) without oil change. The five buses finally complete an average test mileage of 48,525km and the longest test mileage of 50,340km. During test, five test buses operate normally and maintain the lower level of emission, showing the excellent comprehensive performance of the test oil. The buses that use CJ-4 15W-40 diesel engine oil not only extend the oil change period but also improved the fuel economy by nearly 3%. 

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