Abstract: Apparatus for exchanging waste oil with fresh oil in a device such as torque converter, based on a new finding that extracting waste oil from the pan thereof, supplying fresh oil thereinto and after the lapse of some pause time such extract and supply are repeated during said torque converter is kept to operate to circulate oil between the converter proper and the oil pan. The repetition of extract, supply and pause is automatically done according to the operation design stored in the computer with determining the total amount of extracted waste oil and fresh oil to be supplied.

Abstract: The present invention concerns a lubricating composition which comprises:(A) 100 parts by weight of polyorganosiloxane having a viscosity of 50 cSt or more at 25.degree. C., wherein an organic group bonded to a silicon atom being a monovalent hydrocarbon group containing no aliphatic unsaturated bonding and(B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 .mu.m.Also, the present invention concerns a hydraulic fluid which comprises:(C) 100 parts by weight of polyorganosiloxane having a viscosity of 500 cSt or more at 25.degree. C., wherein an organic group bonded to a silicon atom being a methyl group or a phenyl group, and0.01 to 7 parts by weight of Component (B) as mentioned above.

Abstract: A heat transfer wall comprises a heat transfer wall body, a number of fins integrally formed on one surface of the body, extending parallel to each other and having breaks formed therein at predetermined intervals, and a number of beads integrally formed on the other surface of the body. This arrangement may be applied to a heat transfer pipe. Thus, the pipe comprises a heat transfer pipe body, at least one row of spiral fins integrally formed on the outer surface of the body and having breaks formed therein at predetermined intervals, and a number of beads integrally formed on the inner surface of the body.