Semi-synthetic lubricating oil composition

A lubricating oil composition comprising

• a. a major portion of a synthetic lubricant component or a mixture of the synthetic lubricant component and a lubricating hydrocarbon mineral base oil, the synthetic lubricant component having a viscosity between 3.5 and 5.0 centistokes at 210.degree. F., and made by the process comprising
• (1) oligomerizing a mixture of olefins comprising 97 weight percent or more of olefins having 13 or 14 carbon atoms and 99 weight percent or more internal olefins in which the double bond is randomly distributed throughout the carbon chain, comprising reacting the mixture of olefins in the presence of a boron trifluoride catalyst and a protonic promoter at a temperature between 25.degree. and 150.degree. C. sufficient to produce a crude oligomer product,
• (2) neutralizing the crude oligomer product,
• (3) removing the organic layer from the neutralized crude oligomer product,
• (4) mildly stripping the unreacted olefin monomer from the organic layer of the crude oligomer product, at a temperature below 180.degree. C., and
• (5) hydrogenating the stripped oligomer product without further separation, and
• b. minor portions of additive components.

A lubricating oil composition comprising

• a. 10 to 40 weight per cent of a synthetic lubricant component made by the process comprising
• (1) oligomerizing a mixture of olefins having between 9 and 24 carbon atoms inclusive, the mixture being comprised of 99 weight percent or more internal olefins, where the double bond of the internal olefin is randomly distributed throughout the carbon chain comprising reacting the mixture in the presence of a boron trifluoride catalyst and a protonic promoter at a temperature between 25.degree. and 150.degree. C. sufficient to produce a crude oligomer product,
• (2) neturalizing the crude oligomer product,
• (3) removing the organic layer from the neutralized crude oligomer product,
• (4) mildly stripping the unreacted olefin monomer from the organic layer of the crude oligomer product at a temperature below 180.degree. C., and
• (5) hydrogenating the stripped oligomer product, and
• b. effective portions of additive components selected from the list of components consisting of mineral oils, dispersants, antioxidants, detergents, friction modifiers, rust inhibitors, viscosity index improvers, pour point depressants, antifoamants and anti-wear agents.

A lubricating oil composition comprising

• a. a major portion of a synthetic lubricant component or a mixture of the synthetic lubricant component and a lubricating hydrocarbon mineral base oil, the synthetic lubricant component being made by contacting a mixture of olefins having between 9 and 24 carbon atoms, inclusive, and having 99 weight percent or more of internal olefins, where the double bond of the internal olefins is randomly distributed throughout the carbon chain, with a catalyst comprising boron trifluoride at a temperature between about 25.degree. and about 150.degree. C. sufficient to effect oligomerization of said olefins, separating out the unreacted olefins as the only separation step then hydrogenating the oligomerized olefins to make the synthetic lubricant component,
• b. between 0.01 and 15.0 weight percent of a viscosity index improver,
• c. between 0.01 and 10.0 weight percent, on an oil-free basis, of a detergent-dispersant system consisting of one or more detergents and/or one or more dispersants,
• d. between 0.01 and 3.0 weight percent of oxidation and wear inhibitors,
• e. between 10 and 1,000 parts per million of one or more antifoamants, and
• f. effective portions of other additive components selected from the list consisting of friction modifiers, rust inhibitors and pour point depressants.