Fluid for viscous coupling

A fluid for viscous coupling, consisting essentially of:

• an organopolysiloxane having a viscosity of from 1,000 to 500,000 mm.sup.2 /s (25.degree. C.) expressed by the formula:
• ##STR6## where R of said organopolysiloxane represents a hydrocarbon group have 1 to 18 carbon atoms and may be the same or different, and may be halogenated, an n represents an integer of 130 to 1,500;
• up to 5 wt. % of an antioxidant based on the organopolysiloxane;
• at least 0.01 to 5 wt. % of an anti-wear agent based on the organopolysiloxane, selected from the following groups:
• ##STR7##
• 0. 001 to 1.0 weight %, based on said organopolysiloxane, of at least one of a metal deactivator and a corrosion inhibitor, said metal deactivator being at least one type selected from the group consisting of dibasic acids, and monobasic acids;
• said dibasic acids being selected from the group consisting of benzotriazole, benzotriazole derivative, thiadiazole, thiadiazole derivative, triazole, triazole derivative, dithiocarbamate, dithocarbamate derivative, indazole, indazole derivative, adipic acid, sebacic acid, and dodecane diacid;
• and
• said monobasic acid being selected from the group consisting of stearic acid, oleic acid, and lauric acid,
• and amine salts of these substances;
• and
• said corrosion inhibitor being at least one type selected from the group consisting of isosterate, n-octadecylammonium stearate, duomin-T dioleate, lead naphthenate, sorbitan oleate, pentaerythrit oleate, oleyl sarcosine, alkyl succinic acid, alkenyl succinic acid and derivatives of these substances.