Buckets of lubricant or jet fuel can be made by placing empty buckets in the appropriate slots of the grinder or fractionator. They can then be carried to a machine that needs them, to save on piping for long distances. Ethanol can also be bucketed in and out of engines and tanks. 

 Note that if fuel needs to be removed from a tank in large quantities, a Backup Fuel Tank will do so quite readily, pulling sixteen buckets of fuel at a time.