Ioyile esetyenzisiweyo, ekwabizwa ngokuba yioyile yokuthambisa, luhlobo loomatshini, izithuthi, iinqanawa ezithatha indawo yeoyile yokuthambisa, kwinkqubo yokusetyenziswa kungcoliseko lwangaphandle ukuvelisa inani elikhulu lentlaka, i-oxide kwaye ngaloo ndlela ilahlekelwe ukusebenza.Izizathu eziphambili: Okokuqala, ioli esetyenziswayo ixutywe nomswakama, uthuli, enye ioli edibeneyo kunye nomgubo wesinyithi oveliswa ngumatshini wokugqoka, obangela umbala omnyama kunye ne-viscosity enkulu.Okwesibini, ioli iyancipha ngokuhamba kwexesha, yenza i-acids ephilayo, i-colloid kunye ne-asphalt-like substances.