Patent ID: 8709988
Filing Date: 2014-04-29
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition having a TBN of from about 10 to about 18 mg KOH/g, a sulfated ash content of from about 0.8 to about 1.0 mass %, and a phosphorus content of from about 700 to about 800, said lubricating oil composition comprising: (a) a major amount of oil of lubricating viscosity; (b) a minor amount of calcium salicylate detergent; (c) an amount of overbased magnesium detergent having, or having on average, a TBN of from about 300 to about 550 mg KOH/g, providing the lubricating oil composition with from 200 to no greater than 1250 ppm of magnesium; and (d) a low molecular weight, nitrogen-containing dispersant derived from a polymer having a number average molecular weight (Mn) of from about 400 to about 1000, having a TBN of from 40 to 100 mg KOH/g, in an amount providing said lubricating oil composition with from 5 to 25% of the total TBN and from 20 to 60% of the total amount of dispersant nitrogen; and wherein said minor amount of calcium salicylate detergent provides said lubricating oil composition with from 5 to 90% of the total TBN; and said amount of overbased magnesium detergent provides said lubricating oil composition with from 5 to 40% of the total TBN, and wherein said lubricating oil composition contains less than about 100 ppm of boron.