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