A lubricant comprising: (a) an oil of lubricating viscosity; (b) 0.01 to 0.4 percent by weight of a diblock copolymer having a weight average molecular weight of 1000 to 400,000 comprising: (i) at least one hydrophobic block having one or more C 1-30 alkyl (meth)acrylic monomer units, wherein at least 50 wt % of the C 1-30 alkyl (meth)acrylic monomer units contain C 12-15 alkyl (meth)acrylic units, and up to 50 wt % of the C 1-30 alkyl (meth)acrylic units are C 16-20 alkyl (meth)acrylic units, with the proviso that alkyl groups of the C 1-30 alkyl (meth)acrylic units have an average total number of carbon atoms of at least 8; and (ii) at least one additional block having (meth)acrylic units, at least 50 weight percent of the units of which comprise a heteroatom in the non-acid portion of the (meth)acrylic unit, and having an amount of non-heteroatom units of 0 to 50 weight percent or to 25 or to 20 or to 10 weight percent, said heteroatom-containing units imparting polar character to said block in excess of the polar character of the hydrophobic block; wherein the weight ratio of the hydrophobic block or blocks to the additional block or blocks is 2:1 to 100:1; (c) at least one overbased calcium or magnesium detergent in an amount to provide a total calcium plus magnesium concentration in the lubricant of 0.015 to 0.35 percent by weight; (d) at least one phosphorus- containing anti-wear agent that does not contribute to the metal content of the lubricant; and (e) at least one friction modifier suitable to reduce the static coefficient of friction between surfaces. (a) an oil of lubricating viscosity; (b) 0.01 to 0.4 percent by weight of a diblock copolymer having a weight average molecular weight of 1000 to 400,000 comprising: (i) at least one hydrophobic block having one or more C 1-30 alkyl (meth)acrylic monomer units, wherein at least 50 wt % of the C 1-30 alkyl (meth)acrylic monomer units contain C 12-15 alkyl (meth)acrylic units, and up to 50 wt % of the C 1-30 alkyl (meth)acrylic units are C 16-20 alkyl (meth)acrylic units, with the proviso that alkyl groups of the C 1-30 alkyl (meth)acrylic units have an average total number of carbon atoms of at least 8; and (ii) at least one additional block having (meth)acrylic units, at least 50 weight percent of the units of which comprise a heteroatom in the non-acid portion of the (meth)acrylic unit, and having an amount of non-heteroatom units of 0 to 50 weight percent or to 25 or to 20 or to 10 weight percent, said heteroatom-containing units imparting polar character to said block in excess of the polar character of the hydrophobic block; wherein the weight ratio of the hydrophobic block or blocks to the additional block or blocks is 2:1 to 100:1; (i) at least one hydrophobic block having one or more C 1-30 alkyl (meth)acrylic monomer units, wherein at least 50 wt % of the C 1-30 alkyl (meth)acrylic monomer units contain C 12-15 alkyl (meth)acrylic units, and up to 50 wt % of the C 1-30 alkyl (meth)acrylic units are C 16-20 alkyl (meth)acrylic units, with the proviso that alkyl groups of the C 1-30 alkyl (meth)acrylic units have an average total number of carbon atoms of at least 8; and (ii) at least one additional block having (meth)acrylic units, at least 50 weight percent of the units of which comprise a heteroatom in the non-acid portion of the (meth)acrylic unit, and having an amount of non-heteroatom units of 0 to 50 weight percent or to 25 or to 20 or to 10 weight percent, said heteroatom-containing units imparting polar character to said block in excess of the polar character of the hydrophobic block; (c) at least one overbased calcium or magnesium detergent in an amount to provide a total calcium plus magnesium concentration in the lubricant of 0.015 to 0.35 percent by weight; (d) at least one phosphorus- containing anti-wear agent that does not contribute to the metal content of the lubricant; and (e) at least one friction modifier suitable to reduce the static coefficient of friction between surfaces.