| 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 lubric ating 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 2 0 wt% of one or more polyol ester or dibasic acid ester having a kinematic v iscosity of between about 2 to 5 mm2/s at 100 °C mm2/s and further containin g an effective amount of at least one gear oil additive, said lubricating oi l composition having a kinematic viscosity at 100°C between 9 and 12.5 mm2/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 v iscosity 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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