Additive compositions for lubricants and functional fluids

An engine lubricating oil composition, comprising:

• an oil of lubricating viscosity;
• and
• (A) a compound represented by the formula (A-II) ##STR32## wherein in Formula (A-II), G.sup.1 and G.sup.2 consist essentially of and are independently R, OR, or NRR wherein each R is independently a hydrocarbyl group;
• (B) an acylated nitrogen-containing compound made by the reaction of a poly(isobutene)-substituted succinic anhydride with an amine, the poly(isobutene) substituent having between about 50 carbon atoms and about 400 carbon atoms;
• (C) a zinc salt of a compound represented by the formula (A-I);
• ##STR33## wherein in Formula (C-IV), R1 and R2 are independently hydrocarbyl groups;
• said engine lubricating oil composition being characterized by a phosphorous content of up to about 0.10% by weight.

A process for making an engine lubricating oil, comprising mixing:

• an oil of lubricating viscosity;
• and
• (A) a compound represented by the Formula (A-I);
• ##STR34## wherein in Formula (A-I), G.sup.1 and G.sup.2 consist essentially of and are independently R, OR, or NRR wherein each R is independently a hydrocarbyl group;
• X.sup.1 and X.sup.2 are independently O or S, and n is zero to 3;
• (B) an acylated nitrogen-containing compound made by the reaction of a poly(isobutene)-substituted succinic anhydride with an amine, the poly(isobutene) substituent having between about 50 carbon atoms and about 400 carbon atoms;
• said engine lubricating oil composition being characterized by a phosphorous content of up to about a 0.10% by weight.

A process for making an engine lubricating oil, comprising mixing:

• an oil of lubricating viscosity;
• and
• (A) a compound represented by the formula (A-II) ##STR35## wherein in Formula (A-II), G.sup.1 and G.sup.2 consist essentially of and are independently R, OR, or NRR wherein each R is independently a hydrocarbyl group;
• (B) an acylated nitrogen-containing compound made by the reaction of a poly(isobutene)-substituted succinic anhydride with an amine, the poly(isobutene) substituent having between about 50 carbon atoms and about 400 carbon atoms;
• (C) a zinc salt of a compound represented by the formula ##STR36## wherein in Formula (C-IV), R.sup.1 and R.sup. 2 are independently hydrocarbyl groups;
• said engine lubricating oil composition being characterized by a phosphorous content of up to about 0.10% by weight.

An engine lubricating oil composition, comprising:

• an oil of lubricating viscosity;
• (A) a compound represented by the formula ##STR37## wherein each R is independently a hydrocarbyl group of 1 to about 20 carbon atoms;
• and
• (B) an acylated nitrogen-containing compound made by the reaction of a poly(isobutene)-substituted succinic anhydride with an amine, the poly(isobutene) substituent having between about 50 carbon atoms and about 400 carbon atoms;
• said engine lubricating oil composition being characterized by a phosphorus content of up to about 0.08% by weight.

A process for making an engine lubricating oil composition, comprising mixing:

• an oil of lubricating viscosity;
• (A) a compound represented by the formula ##STR38## wherein each R is independently a hydrocarbyl group of 1 to about 20 carbon atoms;
• and
• (B) an acylated nitrogen-containing compound made by the reaction of a poly(isobutene)-substituted succinic anhydride with an amine, the poly(isobutene) substituent having between about 50 carbon atoms and about 400 carbon atoms;
• said engine lubricating oil composition being characterized by a phosphorus content of up to about 0.08% by weight.