The present invention relates to a lubricant and/or clean-out composition comprising: (a) a dispersant component comprising a succinimide dispersant and/or a quaternary ammonium salt dispersant; (b) a carrier fluid component; and (c) an optional corrosion inhibitor, as well as methods of cleaning out deposits in a lubricant system, such as a hydraulic system, using such compositions.

The present invention relates to a lubricant and/or clean-out composition comprising: (a) a dispersant component comprising a succinimide dispersant and/or a quaternary ammonium salt dispersant; (b) a carrier fluid component; and (c) an optional corrosion inhibitor, as well as methods of cleaning out deposits in a lubricant system, such as a hydraulic system, using such compositions.

A mixed powder for powder metallurgy comprises: an iron-based powder; and a lubricant, wherein the lubricant consists of a low-melting-point lubricant having a melting point of 86 C. or less and a high-melting-point lubricant having a melting point of more than 86 C., the low-melting-point lubricant has at least one of an amide group, an ester group, an amino group, and a carboxyl group, a ratio R1 of the low-melting-point lubricant to whole of the lubricant is 5 mass % or more and less than 90 mass %, a ratio R2 of a mass of a free lubricant to a mass of a binding lubricant is 0 or more and 15 or less, and an amount R3 of the low-melting-point lubricant contained as the free lubricant is less than 0.10 parts by mass with respect to 100 parts by mass of the iron-based powder.