A lubrication method comprising applying to a surface to be lubricated a polymer complying with formula below: A-O-R f -(CF 2) x -CFZ-CH 2 -O-R a wherein: - R f is a (per)fluoropolyoxyalkylene chain having an average number molecular weight M n ranging from 100 to 8,000, preferably from 300 to 6,000, more preferably from 800 to 3,000, and comprising, preferably consisting of, repeating units, which may be equal to or different from one another, selected from: (i) -CFXO-, wherein X is F or CF 3, (ii) -CFXCFXO-, wherein X, equal or different at each occurrence, is F or CF 3, with the proviso that at least one of X is -F, (iii) -CF 2 CF 2 CW 2 O-, wherein each of W, equal or different from each other, are F or H, (iv)-CF 2 CF 2 CF 2 CF 2 O-, (v)-(CF 2) j -CFZ'-O- wherein j is an integer from 0 to 3 and Z' is a group of general formula -OR f 'T, wherein R f ' is a fluoropolyoxyalkene chain comprising a number of repeating units from 0 to 10, said recurring units being chosen among the followings: -CFXO-, -CF 2 CFXO-, -CF 2 CF 2 CF 2 O-,-CF 2 CF 2 CF 2 CF 2 O-, with each of each of X being independently F or CF 3 and T being a C 1 -C 3 perfluoroalkyl group; - Z is fluorine or CF 3; - x is 0 or 1, with the proviso that, when, x is 1, Z is F; - A is -(CF 2) x -CFZ-CH 2 -O-R a, wherein x and Z are as defined above, or is a straight or branched C 1 -C 4 perfluoroalkyl group wherein one fluorine atom can be substituted by one chlorine atom or one hydrogen atom, with the proviso that, if chlorine is present in group A, it is in a molar amount lower than 2% with respect to the overall amount of end groups and - R a is a hydroxy-, alkoxy- or acyloxy- terminated polyoxyalkylene chain free from fluorine atoms (chain R a), said chain comprising from 4 to 50 fluorine-free oxyalkylene units, said units being the same or different from one another and being selected from -CH 2 CH 2 O-, -CH 2 CH(CH 3)O-, -CH 2 CH(CH 2 CH 3)O- and-CH 2 CH(Ph)O-, with the proviso that, if A is -(CF 2) x -CFZ-CH 2 -R a and chain R a is hydroxy-terminated and comprises only -CH 2 CH 2 O- units, chain R f does not consist only of -CF 2 CF 2 O- repeating units. - R f is a (per)fluoropolyoxyalkylene chain having an average number molecular weight M n ranging from 100 to 8,000, preferably from 300 to 6,000, more preferably from 800 to 3,000, and comprising, preferably consisting of, repeating units, which may be equal to or different from one another, selected from: (i) -CFXO-, wherein X is F or CF 3, (ii) -CFXCFXO-, wherein X, equal or different at each occurrence, is F or CF 3, with the proviso that at least one of X is -F, (iii) -CF 2 CF 2 CW 2 O-, wherein each of W, equal or different from each other, are F or H, (iv)-CF 2 CF 2 CF 2 CF 2 O-, (v)-(CF 2) j -CFZ'-O- wherein j is an integer from 0 to 3 and Z' is a group of general formula -OR f 'T, wherein R f ' is a fluoropolyoxyalkene chain comprising a number of repeating units from 0 to 10, said recurring units being chosen among the followings: -CFXO-, -CF 2 CFXO-, -CF 2 CF 2 CF 2 O-,-CF 2 CF 2 CF 2 CF 2 O-, with each of each of X being independently F or CF 3 and T being a C 1 -C 3 perfluoroalkyl group; (i) -CFXO-, wherein X is F or CF 3, (ii) -CFXCFXO-, wherein X, equal or different at each occurrence, is F or CF 3, with the proviso that at least one of X is -F, (iii) -CF 2 CF 2 CW 2 O-, wherein each of W, equal or different from each other, are F or H, (iv)-CF 2 CF 2 CF 2 CF 2 O-, (v)-(CF 2) j -CFZ'-O- wherein j is an integer from 0 to 3 and Z' is a group of general formula -OR f 'T, wherein R f ' is a fluoropolyoxyalkene chain comprising a number of repeating units from 0 to 10, said recurring units being chosen among the followings: -CFXO-, -CF 2 CFXO-, -CF 2 CF 2 CF 2 O-,-CF 2 CF 2 CF 2 CF 2 O-, with each of each of X being independently F or CF 3 and T being a C 1 -C 3 perfluoroalkyl group; - Z is fluorine or CF 3; - x is 0 or 1, with the proviso that, when, x is 1, Z is F; - A is -(CF 2) x -CFZ-CH 2 -O-R a, wherein x and Z are as defined above, or is a straight or branched C 1 -C 4 perfluoroalkyl group wherein one fluorine atom can be substituted by one chlorine atom or one hydrogen atom, with the proviso that, if chlorine is present in group A, it is in a molar amount lower than 2% with respect to the overall amount of end groups and - R a is a hydroxy-, alkoxy- or acyloxy- terminated polyoxyalkylene chain free from fluorine atoms (chain R a), said chain comprising from 4 to 50 fluorine-free oxyalkylene units, said units being the same or different from one another and being selected from -CH 2 CH 2 O-, -CH 2 CH(CH 3)O-, -CH 2 CH(CH 2 CH 3)O- and-CH 2 CH(Ph)O-,