In accordance with the present invention, there are provided low sulfated ash lubricating oil compositions which comprise an oil of lubricating viscosity as the major component and as the minor component (A) at least about 3 wt% of at least one ashless nitrogen- or ester-containing dispersant, (B) at least about 2 wt% of at least one sulfurized alkyl phenol, and (C) at least one metal dihydrocarbyl dithiophosphate wherein the hydrocarbyl groups contain an average of at least 6 carbon atoms, and wherein the lubricating oil is characterized by a total sulfated ash (SASH) level of from 0.01 to about 0.6 wt% and by a SASH:dispersant wt:wt ratio of from about 0.01 to about 0.2:1.
根据本发明,提供了低
硫酸盐灰分润滑油组合物,该组合物包括作为主要成分的润滑粘度油和作为次要成分的 (A) 至少约 3 wt%的至少一种无灰含氮或含酯分散剂、(B) 至少约 2 wt% 的至少一种
硫化烷基
酚,以及 (C) 至少一种
金属二氢羰基
二硫代磷酸酯,其中羰基平均含有至少 6 个碳原子,其中润滑油的总
硫酸盐灰分 (
SASH) 含量为 0.01至约0.6 wt%,
SASH与分散剂的重量比为约0.01至约0.2:1。