ossigenati, come alcoli (metanolo, etanolo), eteri [quali MTBE (etere metilterbutilico), ETBE (etere etilterbutilico), TAME (ter-amil-metil etere)],
oxygenaten, zoals alcoholen (methanol, ethanol), ethers (bv. MTBE (methyl-tertiair-butylether), ETBE (ethyl-tertiair-butylether), TAME (tertiair-amyl-methylether).