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英国铁路每年耗于内燃机车的燃油达七亿多升。接连不断的石油危机促进了多粘度等级通用润滑油的研究。这些润滑油可节省柴油机的燃料消耗。但到目前为止还没有任何资料来显示在大型中速柴油机上使用多粘度等级通用润滑油可能产生的效益。因此英国铁路部门有必要开辟这种具有特殊配方限制的材料在应用上的研究。在基本满足了试验室试验要求后,三种多粘度等级润滑油经过了运行试验。运行试验中的数据表明,润滑油的某些特征可以更准确地确定。试验中也出现了几个未预料到的问题,这些问题的解决对于配方配制关系重大。尽管如此,所得的结果亦表明了英国铁路运营部门通过使用SAE15W/40多粘度等级通用润滑油替代SAE30单粘度等级润滑油已取得了节省柴油机燃料的效果。每年可节约二百万至四百万英镑的费用。
British Rail consumes more than 700 million liters of diesel annually. The successive oil crisis has promoted the research of multi-viscosity grades of general lubricants. These lubricants can save diesel fuel consumption. But so far there is no information to show the benefits of using multi-viscosity grade general purpose lubricants on large medium-speed diesel engines. Therefore, it is necessary for the British railway department to open up the application research of this kind of material with special formulation restrictions. After basically meeting the requirements of laboratory tests, the three multi-viscosity grade lubricants have been subjected to running tests. The data from the run tests show that certain characteristics of the lubricating oil can be more accurately determined. Several unforeseen problems have also emerged in the trial, and the solution to these problems is of great importance for formulation. In spite of this, the results obtained also show that British Rail operations have achieved the effect of saving diesel fuel by using SAE 15W / 40 multi-viscosity grade general purpose lubricants instead of SAE 30 single viscosity grade lubricants. It can save two to four million pounds a year.