Lubricating oil composition

A crankcase lubricating oil composition having a Total Base Number in the range from about 5 to 40 comprising a major proportion of a mineral lubricating oil containing from about 0.1 to 5 weight percent of at least one overbased calcium sulfonate, from about 0.1 to 1 weight percent of a zinc dithiophosphate represented by the formula:

• ##STR7## in which R is a hydrocarbyl radical or a hydroxy substituted hydrocarbyl radical having from 4 to 12 carbon atoms from about 0.5 to 10 weight percent of nitrogen-containing dispersant represented by the formula:
• ##STR8## where R is alkenyl of from 50 to 200 carbons and x is an integer of 0 to 10, from 0.1 to 5 weight percent of an overbased calcium sulfonate sufficient to impart to the composition a Total Base Number of between about 5 and 40;
• between about 0.3 and 10 weight percent of an ethoxylated inorganic phosphorus acid free steam hydrolyzed NO.sub.2 -blown polybutene (800-2500 MW) P.sub.2 S.sub.5 reaction product, from about 0.1 and 7.00 weight percent of an overbased sulfurized calcium phenolate and a minor friction reducing amount of at least one acyl glycine oxazoline of the formula:
• ##STR9## where R is lauryl, C.sub.11 H.sub.23, oleyl or stearyl;
• R' is hydrogen or (lower) alkyl.