QSA® combines a number of varying approaches to determine the sludge and varnish potential of lubricants. Led by Jonathan Rudnick, Bureau Veritas Technical Director, Bureau Veritas has independently researched this problem for a number of years. Over time we identified other organizations including oil companies, filtration companies and many end users that were also concerned about the problems of varnish build-up and the inability to identify its presence with traditional laboratory testing. These companies, including Clarus Technologies, Shell Oil, ChevronTexaco, Kleentek, and a number of plastics manufacturers and power producers were very helpful in our developmental work on QSA®.