Patent ID: 11970671
Assignee: AFTON CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A lubricating composition comprising:
one or more base oils of lubricating viscosity;
sulfurized additives providing at least about 1,500 ppm of sulfur to the lubricating composition;
one or more boronated dispersants providing about 40 ppm to about 500 ppm boron to the lubricating composition;
a detergent system providing about 0.2 to about 1.0 weight percent soap content to the lubricating composition and providing magnesium, sodium, and calcium, wherein the detergent system provides greater than about 90 ppm of sodium and no more than about 1,000 ppm of magnesium to the lubricating composition, and wherein the detergent system has a weight ratio of sodium-to-magnesium of about 0.4 to 2.0, and a weight ratio of sulfur-to-sodium of about 12 or less;
wherein the lubricating composition is contaminated with up to about 30 weight percent of biodiesel fuel and wherein the lubricating composition exhibits viscosity stability upon oxidization when tested pursuant to GFC Lu-43-A-11; and
wherein the lubricating composition includes about 90 ppm to about 1,000 ppm of sodium, about 500 ppm to about 2,000 ppm of calcium, about 100 to about 1,000 ppm of magnesium, about 1,500 to about 4,000 ppm of sulfur, and a weight ratio of calcium-to-magnesium of about 0.5 to about 2.5.