| abstract |
Even if the present invention is used as the base oil using group II and group III, the generation of deposit is also few, and the crosshead diesel engine system oil with excellent high temperature detergency and anti-coking properties (heat resistance), a kind of System lubricant oil composition for crosshead-type diesel engine is provided, it is characterized in that, it is made up of allotment metal class cleaning agent (B) and zinc dithiophosphate (C) in base oil (A), the base number of the System lubricant oil composition for crosshead-type diesel engine is 4~20mgKOH/g, phosphorus content is 200~1000 mass ppm, wherein, the base oil (A) includes：Base oil (A 1), kinematic viscosity of the base oil (A 1) at 100 DEG C is 4.0~12.6mm 2 /s；And base oil (A 2), kinematic viscosity of the base oil (A 2) at 100 DEG C is 16.3~60mm 2 / s, the kinematic viscosity that its saturated hydrocarbon content is less than at 90 mass %, 100 DEG C of the base oil (A) is 8.5~12.6mm 2 Aromatic content more than/s, and three rings is more than 1.05 mass %. |