| 摘要 |
A method for improving the oil drain interval, fuel and energy efficiency of heavy duty geared machinery by lubricating said apparatus using a lubricating oil composition comprising as base oil about 20 to 75 wt % PAO 2 to 10, about 5 to 40 wt % PAO 150-1000, about 10 to 40 wt % PAO 20-100, about 5 to 20 wt % of one or more polyol ester or dibasic acid ester having a kinematic viscosity of between about 2 to 5 mm<SUP>2</SUP>/s at 100° C. mm<SUP>2</SUP>/s and further containing an effective amount of at least one gear oil additive, said lubricating oil composition having a kinematic viscosity at 100° C. between 9 and 12.5 mm<SUP>2</SUP>/s, and exhibiting a traction coefficient value ( 100 °C./30 SSR value) of 0.0197 or less, a Brookfield viscosity at -40° C. of about 26,000 cP or less a CCS viscosity at -25° C. of 4200 cP or less, a flash point of 220° C. or higher and a NOACK volatility of 15% or less.
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