Engine oils for racing applications and method of making same

An automotive racing oil comprising:

• base oil comprising polyalphaolefin and racing oil components effective to produce automotive racing oil properties comprising a kinematic viscosity of from about 3.2 centistokes (cSt) to about 25 cSt at 100° C. and a coefficient of friction of about 0.065 or less at 180° C.;
• the racing oil components comprising:
• one or more oil-soluble molybdenum compound selected from the group consisting of molybdenum dithiocarbamates and molybdenum dithiophosphates, the automotive racing oil having a molybdenum concentration of more than 360 ppm, as measured by X-ray fluorescence;
• and,
• one or more anti-wear additive comprising zinc selected from the group consisting of zinc dihydrocarbyl dithiophosphates and zinc dihydrocarbyl dithiocarbamates, the automotive racing oil having a zinc concentration of about 2000 ppm or more, as measured by X-ray fluorescence;
• and,
• a quantity of a combination of esters maintaining the racing oil components in solution in the base oil, the combination of esters comprising one or more multiester(s) and one or more polyol monoester(s).

An automotive racing oil comprising:

• base oil comprising polyalphaolefin and racing oil components effective to produce automotive racing oil properties comprising a kinematic viscosity of from about 3.2 centistokes (cSt) to about 25 cSt at 100° C. and a coefficient of friction of about 0.065 or less at 180° C.;
• the racing oil components comprising:
• mononuclear dithiocarbamates having the following general structure:
• di-nuclear dithiocarbamates having the following general structure:
• wherein
• R1 and R2 are selected from the group consisting of alkyl groups, aryl groups, aralkyl groups, alkoxyalkyl groups, cycloalkyl groups, and cycloalkenyl groups having from 1 to about 30 carbon atoms;
• X and Y are selected from the group consisting of sulfur and oxygen;
• and,
• molybdenum oxysulfide compounds have the following general structure:
• wherein X1-X4 independently are selected from the group consisting of a sulfur atom and an oxygen atom;
• and
• Z is selected from groups having the following general structure:
• wherein R1 to R4 independently are selected from the group consisting of alkyl groups, aryl groups, aralkyl groups, alkoxyalkyl groups, cycloalkyl groups, and cycloalkenyl groups having from 1 to about 30 carbon atoms;
• the automotive racing oil having a molybdenum concentration of from about 500 ppm to about 1200 ppm, as measured by X-ray fluorescence;
• one or more zinc dihydrocarbyl dithiophosphates having the following general structure:
• wherein R7 is an alkyl group having 3 carbon atoms and R8 is an alkyl group having 6 carbon atoms, the automotive racing oil having a zinc concentration of from about 2000 ppm to about 2600 ppm, as measured by X-ray fluorescence;
• one or more detergent comprising calcium producing a calcium concentration of from about 550 ppm to about 900 ppm in the automotive racing oil, as measured by X-ray fluorescence;
• one or more modified or unmodified succinimide comprising nitrogen, contributing a nitrogen concentration of about 500 ppm to about 1500 ppm in the automotive racing oil;
• and,
• from about 0.5 to about 2 wt. %, based on the total weight of the racing oil, of one or more antioxidant comprising a combination of hindered phenols and amines selected from the group consisting of diaryl amines and alkyl derivatives thereof, aryl naphthyl amines and alkyl derivatives thereof, and combinations thereof;
• from about 8 ppm to about 25 ppm of one or more anti-foaming agent;
• and
• a combination of esters comprising one or more polyol monoesters have the following general structure:
• wherein R is selected from the group consisting of alkyl groups and alkenyl groups having about 14 carbon atoms or more and R′ is a polyhydric alcohol having from about 3 to about 6 carbon atoms;
• and,
• when the base oil has a viscosity of from about 2 to about 10 cSt at 100° C., the one or more multiester(s) are selected from the group consisting of diester(s) having the following general structure:
• wherein
• n is from about 4 to about 10;
• R5 and R6 are selected from the group consisting of alkyl groups and alkenyl groups having about 10 carbon atoms or more;
• and,
• when the base oil has a viscosity of about 10 cSt or more at 100 2C, the one or more multiester(s) are aromatic carboxylic acid triester(s).

A method for formulating automotive racing oil comprising:

• providing base oil comprising polyalphaolefin;
• and
• mixing said base oil with racing oil components under conditions effective to produce the automotive racing oil comprising a kinematic viscosity of from about 3.2 centistokes (cSt) to about 25 cSt at 100° C., and a coefficient of friction of about 0.065 or less at 180° C., the racing oil components consisting essentially of:
• a quantity of one or more oil soluble molybdenum compound(s) effective to produce a molybdenum concentration of more than 360 ppm, as measured by X-ray fluorescence;
• an amount of anti-wear component comprising zinc effective to produce a zinc concentration of about 1400 ppm or more, as measured by X-ray fluorescence;
• and,
• a quantity of a combination of esters effective to maintain the racing oil components in solution in the base oil;
• one or more detergent comprising metal having a valence of +2;
• one or more dispersant comprising nitrogen;
• and,
• one or more antioxidant selected from the group consisting of aminic antioxidant, phenolic antioxidant, and combinations thereof;
• and,
• one or more antifoaming agent.