The DIN 51750 series of standard covers: crude oils, liquid petroleum products (e.g. engine fuels, special boiling point spirits and white spirits, fuel oils, kerosene and liquid lubricants (c.f. DIN 51750 Part 2 for sampling procedure), as well as pasty and solid petroleum products (e.g. lubricating greases, petroleum jelly and paraffins (c.f. DIN 51700 Part 3 for sampling procedure). Where the petroleum product can be liquefield by heating without that changing its composition, sampling may also be carried out as specified in DIN 51750 Part 2.