Abstract: This invention relates to a low-sulfur consumable lubricating oil composition, comprising: a base oil; an acylated nitrogen-containing compound having a substituent of at least about 10 aliphatic carbon atoms; and a sulfur content of about 5 to about 250 ppm; said composition being characterized by the absence of an extreme-pressure additive comprised of metal and phosphorus.

Abstract: This invention relates to a method of operating an internal combustion engine comprising a valve train, said method comprising: (A) operating said engine using a normally liquid or gaseous fuel; (B) lubricating components of said valve train using a solid film lubricant; and (C) lubricating said engine, including said components of said valve train, using a low-phosphorus or phosphorus-free lubricating oil composition, said low-phosphorus or phosphorus-free lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said low-phosphorus or phosphorus-free lubricating oil composition by said extreme-pressure additive does not exceed about 0.08% by weight based on the weight of said low-phosphorus or phosphorus-free lubricating oil composition.

Abstract: This invention relates to a method of operating a spark ignition four-stroke internal combustion engine comprised of a valve train and a crankcase and equipped with an exhaust gas aftertreatment device, said method comprising: (A) operating said engine using a gasoline fuel composition, the exhaust gas from the operation of said engine being advanced through said aftertreatment device; (B) lubricating said crankcase using a first lubricating oil composition, said first lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said first lubricating oil composition does not exceed about 0.04% by weight based on the weight of said first lubricating oil composition; and (C) lubricating said valve train using a second lubricating oil composition.

Abstract: This invention relates to a low-sulfur consumable lubricating oil composition, comprising: a base oil; an acylated nitrogen-containing compound having a substituent of at least about 10 aliphatic carbon atoms; and a sulfur content of about 5 to about 250 ppm; said composition being characterized by the absence of an extreme-pressure additive comprised of metal and phosphorus.

Abstract: This invention relates to a method of operating a camless internal combustion engine, said method comprising: (A) operating said engine using a normally liquid or gaseous fuel composition; and (B) lubricating said engine using a low-phosphorus or phosphorus-free lubricating oil composition, said low-phosphorus or phosphorus-free lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said low-phosphorus or phosphorus-free lubricating oil composition by said extreme-pressure additive does not exceed about 0.08% by weight based on the weight of said low-phosphorus or phosphorus-free lubricating oil composition.

Abstract: This invention relates to a low-sulfur consumable lubricating oil composition, comprising: a base oil; an acylated nitrogen-containing compound having a substituent of at least about 10 aliphatic carbon atoms; and a sulfur content of about 5 to about 250 ppm; said composition being characterized by the absence of an extreme-pressure additive comprised of metal and phosphorus.

Abstract: This invention relates to a method of operating an internal combustion engine comprising a valve train, said method comprising: (A) operating said engine using a normally liquid or gaseous fuel; (B) lubricating components of said valve train using a solid film lubricant; and (C) lubricating said engine, including said components of said valve train, using a low-phosphorus or phosphorus-free lubricating oil composition, said low-phosphorus or phosphorus-free lubricating oil composition optionally containing an extreme-pressure additive comprised of metal and phosphorus, provided the amount of phosphorus contributed to said low-phosphorus or phosphorus-free lubricating oil composition by said extreme-pressure additive does not exceed about 0.08% by weight based on the weight of said low-phosphorus or phosphorus-free lubricating oil composition.