On Tue, 13 Feb 2018 22:50:47 -0500, Ed Huntress
wrote:


test that I can subject the oil to?
sulphur will tarnish silver. Dip a clean silver spoon or fork in the
oil. If it tarnishes you KNOW it has sulphur. If it doesn't you are
still guessing.

You could do a Lassaignes test (look it up) - but for "several tons"
it would be worth having an oil analysis done - the spectrometer will
tell you the WHOLE story.