Generally imported lubricants will be used by sea, sea transportation is rarely used 18L barrels, because the damage rate of small barrels in the sea transportation is very high, increase the cost of protection and too high. Generally are 200L drums, container liquid bag soft package, or ISO-Tank. 4L packaging does not have this problem. Therefore, the vast majority of companies will go to the domestic distribution. And those who have production bases in China will generally choose to distribute in the domestic production base.
Of course, if it is a steel drum, there is no such problem.
If you want to test, it is recommended that Noack evaporation loss test, the general fake oil because the use of low-cost base oil, evaporation loss is relatively large.