| abstract |
A method for producing a mechanical part comprising sizing a sintered metal unit with application of a lubricating oil composition containing (A) a lubricating base oil having a kinematic viscosity of 0.5 to 150 mm 2 /s at 40° C., and compounded therein (B) as an extreme-pressure and rust preventing agent, a high basic Ca sulfonate in an amount of 5 to 80% by mass, (C) as a rust preventing agent, a neutral Ba sulfonate and/or a fatty acid ester of a polyhydric alcohol in an amount of 0.5 to 30% by mass, (D) as a metal deactivator, a benzotriazole compound and/or thiadiazole compound in an amount of 0.005 to 10% by mass, and (E) an anti-oxidizing agent in an amount of 0.05 to 10% by mass, each based on a total amount of the composition. |