| abstract |
marine engine lubricating oil composition, method for preparing a marine engine lubricating oil composition, use of a combination of additives, and, method for operating a marine engine a trunk piston lubricating oil composition of 20 to 60 tbn, comprising (a) a high saturation low sulfur lubricating viscosity oil, in a major amount; (b) a superbased metal hydroxybenzoate detergent additive; (c) a polysobutene succinic anhydride additive (1-7% by mass); and (d) a meta-linear pentadecyl phenol additive (10.1 to 10% by weight), the weight ratio from (d) to (c) being less than 1 and the combined treatment rate from (b) , (c) and (d) being 5 to 30%. the composition is useful to improve the dispersion of asphaltene when lubricating a marine engine ignored by medium speed compression, fueled by heavy fuel oil. |