A crosslinkable polyolefin composition comprising from 100 to 30 weight percent (wt%) of a carrier mixture and from 0 to 70 wt%, respectively, of one or more optional additives; wherein the carrier mixture consists of from 97.56 to 99.31 weight percent (wt%) of (A) a polyethylene polymer, from 0.40 to 2.0 wt% of (B) an alkenyl-functional monocyclic organosiloxane, and from 0.29 to 0.44 wt% of (C) an organic peroxide; wherein the (A) polyethylene polymer is selected from (A1) and (A2): (A1) an ethylene/alpha-olefin copolymer elastomer having a melt index from 0.6 to 6.2 grams per 10 minutes (g/10 min.) and a density of from 0.854 to 0.912 gram per cubic centimeter (g/cm 3 ), measured according to ASTM D792-13, Method B or (A2) a blend of (A1) and a low-density polyethylene (LDPE) having a melt index of 0.8 to 2.5 g/10 min., wherein the blend has a mass ratio of weight of (A1)-to-weight of (LDPE) ((A1)/(LDPE) wt/wt) of from 99.9/0.1 to 1.0/3.0 and wherein both melt indexes are measured according to ASTM D1238-04 (190° C., 2.16 kg; "I 2 "); wherein the (B) alkenyl-functional monocyclic organosiloxane is of formula (I): [R 1 ,R 2 SiO 2/2 ] n (I), wherein subscript n is an integer greater than or equal to 3; each R 1 is independently a (C 2 -C 4 )alkenyl or a H 2 C=C(R 1a )-C(=O)-O-(CH 2 ) m - wherein R 1a is H or methyl and subscript m is an integer from 1 to 4; and each R 2 is independently H, (C 1 -C 4 )alkyl, phenyl, or R 1 ; and wherein the carrier mixture of the crosslinkable polyolefin composition has a hot creep of less than 175% after being kept at 200° C. for 15 minutes, as measured by the Hot Creep Test Method; with the proviso that the crosslinkable polyolefin composition is free of a phosphazene base; and with the proviso that if the melt index (I 2 ) of the (A1) ethylene/alpha-olefin copolymer elastomer is greater than 2 g/10 min., the amount of (C) organic peroxide is from 0.35 to 0.44 wt%. wherein the carrier mixture consists of from 97.56 to 99.31 weight percent (wt%) of (A) a polyethylene polymer, from 0.40 to 2.0 wt% of (B) an alkenyl-functional monocyclic organosiloxane, and from 0.29 to 0.44 wt% of (C) an organic peroxide; wherein the (A) polyethylene polymer is selected from (A1) and (A2): (A1) an ethylene/alpha-olefin copolymer elastomer having a melt index from 0.6 to 6.2 grams per 10 minutes (g/10 min.) and a density of from 0.854 to 0.912 gram per cubic centimeter (g/cm 3 ), measured according to ASTM D792-13, Method B or (A2) a blend of (A1) and a low-density polyethylene (LDPE) having a melt index of 0.8 to 2.5 g/10 min., wherein the blend has a mass ratio of weight of (A1)-to-weight of (LDPE) ((A1)/(LDPE) wt/wt) of from 99.9/0.1 to 1.0/3.0 and wherein both melt indexes are measured according to ASTM D1238-04 (190° C., 2.16 kg; "I 2 "); wherein the (B) alkenyl-functional monocyclic organosiloxane is of formula (I): [R 1 ,R 2 SiO 2/2 ] n (I), wherein subscript n is an integer greater than or equal to 3; each R 1 is independently a (C 2 -C 4 )alkenyl or a H 2 C=C(R 1a )-C(=O)-O-(CH 2 ) m - wherein R 1a is H or methyl and subscript m is an integer from 1 to 4; and each R 2 is independently H, (C 1 -C 4 )alkyl, phenyl, or R 1 ; and wherein the carrier mixture of the crosslinkable polyolefin composition has a hot creep of less than 175% after being kept at 200° C. for 15 minutes, as measured by the Hot Creep Test Method; with the proviso that the crosslinkable polyolefin composition is free of a phosphazene base; and with the proviso that if the melt index (I 2 ) of the (A1) ethylene/alpha-olefin copolymer elastomer is greater than 2 g/10 min., the amount of (C) organic peroxide is from 0.35 to 0.44 wt%. <EOS>