How to establish a truck lubricant replacement cycle for overseas fleet management

The lubricant replacement cycle for overseas fleets cannot simply follow the fixed mileage in the manufacturer's manual. Many overseas construction sites have unstable fuel quality and large differences in operating conditions. Simply maintaining based on mileage can easily lead to premature engine wear or increased costs due to excessive maintenance. It is necessary to comprehensively set the mileage, working hours, and time thresholds based on operating conditions, fuel quality, environmental conditions, and oil type, with the first to arrive being the standard. Firstly, based on the original maintenance standards of the engine factory, two sets of baselines are distinguished: normal working conditions and harsh working conditions. Long distance mainline constant speed standard load belongs to the conventional working conditions, which can refer to the recommended cycle of the factory. Mining areas, slag short distance, frequent start stop, long-term idle, high dust and high temperature, or high-altitude areas are all classified as harsh working conditions, and the cycle should be shortened by 30% to 50%. Vehicles with excessive idle should be counted according to engine hours first, rather than driving mileage, because the engine oil is also aging, prone to fuel dilution and condensation water ingress during idle. Secondly, the focus is on evaluating the local fuel quality. In many overseas regions, diesel fuel has high sulfur content and impurities, which can accelerate oil acidification and deterioration. In this case, it is necessary to compress the oil change cycle and use engine oil grades that meet emission requirements. Only in areas with low sulfur fuel can the cycle be moderately extended with the support of oil sample testing. Then distinguish between different assemblies of engine oil, transmission oil, drive axle gear oil, and hydraulic oil, without uniform standards. Engine oil decays the fastest, while axle oil and transmission oil have longer replacement cycles. Hydraulic oil also needs to take into account the risk of dust and water pollution, and establish a separate ledger. For fleets where conditions permit, it is recommended to conduct regular oil sampling and testing to verify whether the cycle is reasonable by detecting the wear metal content, viscosity, and acid value. This is the most reliable way. It is recommended to send the new car for testing twice in a row during the trial operation phase to confirm the safety of the current cycle before implementing the solidification plan. It is also necessary to do a good job in classifying and managing the fleet. If the division of labor for vehicles in the same batch is different, do not use all vehicles in one cycle. Mainline vehicles, construction dump trucks, and cold chain tractors should be filed separately. Use the fleet ledger to record the time, mileage, hours, and oil type of each oil change. Train drivers to identify abnormal signals such as oil emulsification, blackening, and odor, and replace them in advance if any abnormalities occur. Finally, two common misconceptions should be avoided: blindly prolonging the cycle to save spare parts costs, which ultimately leads to greater engine overhaul losses, and blindly shortening the cycle will also increase operation and maintenance expenses. A scientific cycle plan can not only protect the stable operation of the powertrain and adapt to the pain points of slow spare parts supply in remote overseas areas, but also help the fleet balance maintenance costs and vehicle attendance.