Hi VM,
Well any used internal combustion engine that has been run and is not fully stripped and cleaned is classed as DG in the transport game (Dangerous Goods). There are huge penalties for carrying such items in a normal freight consignment. Try shipping a litre of paint interstate as it sends shivers down any truck drivers spine if it's not on the manifest and listed as DG and him then not displaying DG signage on both the front and rear of the truck. Also he must also have a DG license.
there are plenty of cowboys on the long haul runs that will take the chance, but if they get checked by the "Scalies" and they discover it then he's out of a job due to loss of his license and that means no food on the table.
Yes it's all gone very OH&S hasn't it.
Cheers,
BB.