Lubricant composition for oil-impregnated sintered bearings

A lubricant composition for oil-impregnated sintered bearings, which comprises at least one base oil selected from (A) a perfluoropolyether oil represented by the following general formula:

• RfO(CF2CF2O)m(CF2O)nRf
• (where Rf is a perfluoro lower alkyl group having 1-5 carbon atoms, m+n=3-200, and m:n=10-90:90-10, the CF2CF2O group and the CF2O group being bonded at random in the main chain), (B) a perfluoropolyether oil represented by the following general formula:
• RfO[CF(CF3)CF2O]p(CF2CF2O)q(CF2O)rRf
• (where Rf is a perfluoro lower alkyl group having 1-5 carbon atoms, p+q+r=3-200, q and r each may be 0, and (q+r)/p=0-2, the CF(CF3)CF2O group, the CF2CF2O group and the CF2O group being bonded at random in the main chain), and (C) a perfluoropolyether oil represented by the following general formula:
• F(CF2CF2CF2O)sC2F5
• (where s=2-100), and an amide-based compound having a perfluoropolyether group represented by the following general formula:
• RCONHR1NR3R4 [IV]
• (where R is RfO[CF(CF3)CF2O]aCF(CF3)—, RfO(CF2CF2CF2O)aCF2CF2—, RfO[(CF2CF2O)a(CF2O)b]CF2—, or RfO[(CF2CF2O)a(CF2O)b]CF(CF3)—, Rf is a perfluoro lower alkyl group having 1-5 carbon atoms, a and b each are an integer of 1-30, R1 is an alkylene group having 1-30 carbon atoms, some or all of the hydrogen atoms of the alkylene group being replaceable with halogen atoms, and R3 and R4 each are a hydrogen atom or an alkyl group having 1-3 carbon atoms).