Oil lubricant

A method of lubricating an air tool, such that during operation of the air tool, airborne lubricant exhaust mist is reduced or eliminated, the method comprising:

• (a) adding lubricant to a compressed air feed in an amount effective to lubricate an air tool, said lubricant comprising:
• between 58 vol % and 90 vol % of a polyalphaolefin or polyalphaolefin blend having a viscosity between 2 cSt and 3,000 cSt;
• and
• between 10 vol % and 42 vol % of a complex ester comprising polymeric molecules with a cohesive tendency to adhere to each other and to form elongate filaments when subjected to shear stresses;
• and
• (b) supplying said compressed air feed, to which said lubricant is added, to a compressed air feed input region of said air tool for driving said air tool;
• (c) operating said air tool;
• said air tool, during operation, exhausting said compressed air feed as exhaust air from an exhaust region of said air tool;
• said exhaust air including lubricant mist, measurable in ambient air, into which said lubricant is carried by the compressed air exhausted from the air tool, in an amount comprising 0.2 ppm or less of lubricant;
• and
• wherein the complex ester has a molecular structure imparting to the lubricant a charge, and wherein the lubricant is attracted to metal surfaces inside the air tool comprised of oppositely charged ferrous metal and forms a tenacious film on the metal surfaces.