An internal combustion engine can be cleaned of sludge, deposits, or wear debris, by supplying to lubricated surfaces of said engine a composition having a kinematic viscosity of 1 to 10 mm
2
/s at 100° C. comprising oil having at least 15% aromatics by ASTM D-2007; at least 2.5 weight percent of a nitrogen-containing dispersant; at least 0.6 weight percent of an overbased metal detergent; and at least about 0.5 weight percent of a metal salt of a phosphorus acid, circulating the composition through the engine and removing the composition from the engine.
通过向内燃机的润滑表面提供运动粘度为 1 至 10 毫米的组合物,可以清除内燃机上的油泥、沉积物或磨损碎屑。
2
/s 的组合物,该组合物包括:按 ASTM D-2007 标准,
芳烃含量至少为 15%的机油;至少 2.5 重量百分比的含氮分散剂;至少 0.6 重量百分比的过基
金属洗涤剂;以及至少约 0.5 重量百分比的
磷酸金属盐。