Described methods of sampling crude oils and liquid petroleum products (e.g. engine fuels, special boiling point spirits and white spirits, fuel oils, kerosene and liquid lubricants), as well as pasty and solid petroleum products (e.g. lubricating greases, petroleum jelly and paraffins) which can be liquefield by heating without that changing their composition. It does not cover bituminous binders (cf. EN 58), lubricating oils in internal combustion engines (cf. DIN 51574), and liquefield natural gas (cf. DIN 51610). General information on the sampling of petroleum products is provided in DIN 51750 Part 1.