Engine lubricant

Abstract

Lubricant compositions and methods related thereto. Lubricant compositions may comprise a first and a second oil base stock. A first oil basestock may be an API group I or group II basestock. A second oil basestock may comprise an API group II extra heavy basestock. Lubricant compositions may include about 40-60 mass % of a first oil base stock, and about 20-45 mass % of a second oil basestock. An API group II extra heavy basestock may have: a kinematic viscosity (ASTM D445, 40° C.) of 320-520 cSt, a kinematic viscosity (ASTM D445, 100° C.) of 22-36 cSt, a viscosity index (ASTM D2270) of 80-119, a pour point (ASTM D97) of −6° C. or less, and/or a saturate content of 90 mass % or greater. A lubricant composition may have application as an engine oil. Methods of operating an engine may comprise using the engine oil.

Dependencies are inferred from the claim text.