The Coordinating European Council

Maintaining existing tests on an ongoing basis, concentrating on quality assurance

What is CEC?

CEC is an Industry-based organisation which develops Test Methods for the performance testing of Automotive Engine Oil, Fuels & Transmission Fluids (using gasoline & diesel engines). In addition, it covers Marine & Large Engine Oils, Two-stroke Engine Oils & Associated Bench Tests.

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TDG-F-05-93 Closure

TDG-F-05-93 inlet valve cleanliness test has been back in test development status since October 2021. The group decided by consensus at the September 2025 meetings in Vienna to close the group. This was approved by the CEC MB in December 2025.

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CEC Member Organisations