
273
8
Economics and Other
Evaluation Criteria
8.1 INTRODUCTION
Reuse of used lubricating oil has been known and practiced for several decades,
especially with the use of these oils as burner fuel (Chapter 5). Until recently, the
reliability of the re-rened product was an issue. However, the profusion of re-rening
processes—each of which has something to add—has produced product oils that are
able to meet base oil specications and are used (when mixed with the necessary
additives) for the desired lubricating purposes. As a result, the re-rened products
have moved from being a less predictable mix of components to a highly rened
high-value ...