Abstract: Spent motor oil can be reclaimed by a process comprising heating the oil to cause precipitation of a portion of the suspended solids and then treating the oil after separation from the solids with up to about 6% by volume of concentrated sulfuric acid to complete precipitation of the solids. The oil is neutralized with an organic amine to provide a finished product suitable for reuse as a motor oil or as a blending stock for reformulation as a motor oil.

Abstract: A sulfur-chlorinated cyclic oil-fat product for use as the extreme pressure additive to cutting, drawing, lubricating, gear, and like oils is disclosed. The cyclic substituents contains a substantial amount of polynuclear aromatics which is generally a waste product of a catalytic cracking refinery process while the fat product may be the free acids of animal and vegetable fats, such as acidulated foots, which are the waste products from fats after the glycerine has been extracted, or may be the glycerides themselves. The resulting product is an inexpensive extreme pressure additive which, in small percentages, greatly enhances the pressure bearing capacity of a lubricating oil.