Polyorganosiloxane composition X which can be crosslinked to give an elastomer in the presence of water by polycondensation reactions, comprising: A) at least one polyorganosiloxane A comprising at least one alkoxylated group and composed of identical or different siloxyl units, of formula: b (R 4) a SiO [4-(a'+b)]/2 in which: • the symbol Z = [-(OCH 2 CH 2) c -OR 5], with c = 0 or 1, • a = 0, 1, 2 or 3; b = 0, 1, 2 or 3, a + b = 0, 1, 2 or 3, • the symbol R 4 represents a monovalent C 1 to C 13 hydrocarbon radical, • the symbol R 5 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and • with the condition that, for at least one siloxyl unit, the index b ≥ 1, so that the polyorganosiloxane A comprises at least one alkoxylated group Z, B) at least one siloxane D which is a condensate obtained by partial hydrolysis and condensation of a polyalkoxylated silane, said siloxane D having from 2 to 10 identical or different siloxyl units, of formula: (R 2) x' (OR 3) y' SiO [4-(x'+y')]/2 in which: - x' = 0, 1, 2 or 3; y' = 0, 1, 2 or 3; x' + y' = 0, 1, 2 or 3, - the symbol R 2 represents a monovalent C 1 to C 13 hydrocarbon radical, - the symbol R 3 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and - with the condition that, for at least one siloxyl unit, the index y' ≥ 1, C) an additive E capable of absorbing an oil used in a power train, such as acetylene black, D) a catalytically effective amount of at least one condensation catalyst F, E) at least one filler G which is a calcium carbonate with a mean particle diameter of greater than 0.1 μm, optionally treated at the surface with an organic acid or an organic acid ester, F) optionally at least one adhesion promoter H, and G) optionally at least one additive I, such as a coloring base, a pigment or a thixotropic agent. A) at least one polyorganosiloxane A comprising at least one alkoxylated group and composed of identical or different siloxyl units, of formula: b (R 4) a SiO [4-(a'+b)]/2 in which: • the symbol Z = [-(OCH 2 CH 2) c -OR 5], with c = 0 or 1, • a = 0, 1, 2 or 3; b = 0, 1, 2 or 3, a + b = 0, 1, 2 or 3, • the symbol R 4 represents a monovalent C 1 to C 13 hydrocarbon radical, • the symbol R 5 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and • with the condition that, for at least one siloxyl unit, the index b ≥ 1, so that the polyorganosiloxane A comprises at least one alkoxylated group Z, • the symbol Z = [-(OCH 2 CH 2) c -OR 5], with c = 0 or 1, • a = 0, 1, 2 or 3; b = 0, 1, 2 or 3, a + b = 0, 1, 2 or 3, • the symbol R 4 represents a monovalent C 1 to C 13 hydrocarbon radical, • the symbol R 5 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and • with the condition that, for at least one siloxyl unit, the index b ≥ 1, so that the polyorganosiloxane A comprises at least one alkoxylated group Z, B) at least one siloxane D which is a condensate obtained by partial hydrolysis and condensation of a polyalkoxylated silane, said siloxane D having from 2 to 10 identical or different siloxyl units, of formula: (R 2) x' (OR 3) y' SiO [4-(x'+y')]/2 in which: - x' = 0, 1, 2 or 3; y' = 0, 1, 2 or 3; x' + y' = 0, 1, 2 or 3, - the symbol R 2 represents a monovalent C 1 to C 13 hydrocarbon radical, - the symbol R 3 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and - with the condition that, for at least one siloxyl unit, the index y' ≥ 1, - x' = 0, 1, 2 or 3; y' = 0, 1, 2 or 3; x' + y' = 0, 1, 2 or 3, - the symbol R 2 represents a monovalent C 1 to C 13 hydrocarbon radical, - the symbol R 3 represents a monovalent C 1 to C 6 hydrocarbon radical or an alkoxyalkyl radical optionally comprising an ester functional group, and - with the condition that, for at least one siloxyl unit, the index y' ≥ 1, C) an additive E capable of absorbing an oil used in a power train, such as acetylene black, D) a catalytically effective amount of at least one condensation catalyst F, E) at least one filler G which is a calcium carbonate with a mean particle diameter of greater than 0.1 μm, optionally treated at the surface with an organic acid or an organic acid ester, F) optionally at least one adhesion promoter H, and G) optionally at least one additive I, such as a coloring base, a pigment or a thixotropic agent.