Various refinery plants for the treatment of used lubricating oil are in operation and others in course of erection. In addition a large number of lubricating oil consumers filter their used oil for further use. In this way large quantities of lubricating oil are re-used, but owing to the fact that much of the recovery of used oil is effected within the consumers' works, I regret that figures of quantities treated for re-use are not available.
Is there not a large quantity of used lubricating oil which is suitable for fuel and not for the purposes of maintenance? It is rather to that lubricating oil that my Question refers.
If my hon. Friend looks at the Answer to the Question he will see that when I said "re-used," I do not necessarily mean lubricating oil but oil used also as fuel oil.