Reduced friction lubricants comprising magnesium detergents and/or overbased magnesium detergents and molybdenum based friction modifiers

A lubricant composition comprising:

• A) a lubricating oil;
• B) from about 0.2 to about 4.0 wt %, based on the total weight of the lubricant composition, of an overbased magnesium detergent;
• C) from about 0.2 to about 1.5 wt %, based on the total weight of the lubricant composition, of a molybdenum based friction reducing additive comprising the reaction product of:
• (a) an unsaturated or saturated ester or acid,
• (b) a diamine of the formula:
• wherein R8 is an alkyl group of 1 to 40 carbon atoms, R9 and R10 are independently selected aliphatic or aromatic moieties, and W is oxygen, sulfur, or —CH2—,
• (c) carbon disulfide, and
• (d) a molybdenum compound, and
• D) from about 0.2 to about 1.5 wt %, based on the total weight of the lubricant composition, of one or more tatty acid 2-hydroxyalkylamide compounds of formula I:
• wherein n is 1 or 2;
• when n is 1, m is 1;
• when n is 2, m is 0, R is H or C1-12 alkyl, G is H or C1-6 alkyl, and R′ is selected from C7-23 alkyl or alkenyl, and wherein the weight ratio of the molybdenum based friction reducing additive to the one or more fatty acid 2-hydroxyalkylamide compounds of formula I is from 1:1.1 to 1:5.

A method for lowering friction in a lubricant composition comprising from about 0.2 to about 4.0 wt %, based on the total weight of the resulting lubricant composition, of an overbased magnesium detergent, said method comprising adding to the lubricant composition from 0.2 to 1.5 wt %, based on the total weight of the resulting lubricant composition, of a mixed thio acid amide molybdenum dithiocarbamate comprising the reaction product of:

• (a) an unsaturated or saturated ester or add,
• (b) a diamine of the formula:
• wherein R8 is an alkyl group of 1 to 40 carbon atoms, R9 and R10 are independently selected aliphatic or aromatic moieties, and W is oxygen, sulfur, or —CH2—,
• (c) carbon disulfide, and
• (d) a molybdenum compound, and
• D) from about 0.2 to about 1.5 wt %, based on the total weight of the lubricant composition, of one or more fatty add 2-hydroxyalkylamide compounds of formula I:
• wherein n is 1 or 2;
• when n is 1, m is 1;
• when n is 2, m is 0,
• R is H or C1-12 alkyl,
• G is H or C1-6 alkyl, and
• R′ is selected from C7-23 alkyl or alkenyl, and
• wherein the weight ratio of the molybdenum based friction reducing additive to the one or more fatty add 2-hydroxyalkylamide compounds of formula I is from 1:1.1 to 1:5.