The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

This invention relates to a diesel engine lubricating oil composition comprising or resulting from the admixing of: (i) base oil, (ii) a functionalized polymer, (iii) an overbased magnesium based detergent, and (iv) one or more, optionally borated, higher and/or lower molecular weight PIBSA-PAM dispersant. The composition has a total sulfated ash of less than or equal to 0.9 wt. %, a kinematic viscosity at 100 C. of 5 to 20 cSt, a total phosphorous level of less than or equal to 0.120 wt. %, and a total sulfur level of less than or equal to 0.35 wt. % and provides a Detroit DD-13 scuffing test result of at least 31 hours. Also provided are a method of making the composition, a method of lubricating a diesel engine, a method of improving wear performance and engine cleanliness and reducing emissions of a diesel engine, and a diesel engine oil additive concentrate composition.

This invention relates to a diesel engine lubricating oil composition comprising or resulting from the admixing of: (i) base oil, (ii) a functionalized polymer, (iii) an overbased magnesium based detergent, and (iv) one or more, optionally borated, higher and/or lower molecular weight PIBSA-PAM dispersant. The composition has a total sulfated ash of less than or equal to 0.9 wt. %, a kinematic viscosity at 100 C. of 5 to 20 cSt, a total phosphorous level of less than or equal to 0.120 wt. %, and a total sulfur level of less than or equal to 0.35 wt. % and provides a Detroit DD-13 scuffing test result of at least 31 hours. Also provided are a method of making the composition, a method of lubricating a diesel engine, a method of improving wear performance and engine cleanliness and reducing emissions of a diesel engine, and a diesel engine oil additive concentrate composition.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

Provided is a an additive or composition for imparting lubricity which has high lubricity, is excellent in low-corrosion property, low-temperature fluidity, thermal conductivity, thermal stability, and oxidative stability, and has high flashing point. The lubricant according to the present invention is an additive or composition, wherein the following components (A) an amine or an ammonium compound; and (B) an acid or a salt thereof, have been added therein, wherein at least one of the components (A) and (B) contains a hydrogen-bonding functional group.

Provided is a an additive or composition for imparting lubricity which has high lubricity, is excellent in low-corrosion property, low-temperature fluidity, thermal conductivity, thermal stability, and oxidative stability, and has high flashing point. The lubricant according to the present invention is an additive or composition, wherein the following components (A) an amine or an ammonium compound; and (B) an acid or a salt thereof, have been added therein, wherein at least one of the components (A) and (B) contains a hydrogen-bonding functional group.