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2004年3月,在北京公交公司进行了长城15W-40 CI-4柴油机油的行车监测试验。长城15W-40 CI-4柴油机油在行车试验中表现出良好的抗氧化性、高温清净性、抗磨性等性能,可在公交车辆高频度使用、超负荷运转、超载频繁等情况下为发动机提供良好的保护,延长发动机使用寿命和换油期,从而降低车辆的保养成本,提高车队乃至公交公司的经济效益。
March 2004, the Beijing bus company conducted a Great Wall 15W-40 CI-4 diesel engine traffic monitoring test. Great Wall 15W-40 CI-4 diesel engine oil in the driving test showed good oxidation resistance, high temperature detergency, abrasion resistance and other properties, can be used in high frequency buses, overloaded operation, overloading and other frequent cases The engine provides good protection, prolongs the service life of the engine and the oil change period, so as to reduce the vehicle maintenance costs and increase the economic benefits of the fleet and even the bus company.