As a consequence of a close collaboration between Chrysler Corporation and Savant Laboratory, a small bench-top instrument was developed to simulate engine operating stresses on the engine oil. The area of particular interest was deposit formation.  Thus, the Chrysler/Tannas TEOST has become an alternative to using large, relatively variable, expensive and time-consuming engine test stands.  The ability to change a variety of test parameters on the TEOST apparatus lends itself to research work beyond the original Protocol 33C procedure.

Since its introduction, the TEOST Protocol 33C has been incorporated in the ILSAC GF-2 specification. This test, along with a new protocol yet to be named, is expected to also be included into the GF-3 requirement.