Patent ID: 7419941

Claim:
A lubricant oil composition, comprising: a base oil selected from Type II, II+ or III base oil present in said composition at a level of at least 90% of the total weight of the composition, a dispersant present in the range of 0.01 to 10 percent by weight of the total composition and an additive package comprising wear-resistant suspended nanoparticles, wherein the wear-resistant nanoparticles are (a) a Group 1a alkali metal carbonate, a Group 2a alkaline earth metal carbonate, or a mixture thereof; (b) a Group 1a alkali metal sulfate, a Group 2a alkaline earth metal sulfate, or a mixture thereof; (c) a Group 1a alkali metal phosphate, a Group 2a alkaline earth metal phosphate, or a mixture thereof; and (d) a Group 1a alkali metal carboxylate, a Group 2a alkaline earth metal carboxylate or a mixture thereof; and wherein each of the wear-resistant nanoparticles are present in an amount of 0.1 to 10% of the total composition and the nanoparticles have a mean diameter in the range from 1 to 100 nanometers.