50 years experience in formulation and manufacturing of fuel additives, special lubricants and high performance maintenance products. 3 generations of dedicated technicians continuously searching for high performances solutions and products to meet the market requirements. Since 2006, all our products and SELD technologies have been marketed under our brand MécaTech®.

Obtain the best performances

Improve effiency and mileage

Maintain the best possible reliability

Our range adresses a large public stretching from motorsports to heavy industry through the automobile industry, transport vehicles, public-work equipment, farming equipment, nautical sector, ski lifts…

Technologie & Innovation

All MécaTech® products are formulated on the based on the most advanced research and technology: All MécaTech® additives meet the most demanding European standards and are approved by  the largest petroleum companies. Exclusive GDA® technology for anti-wear/antifriction  surface treatment. Uses of Nano Technology for: MoS2, PTFE, WS2, Graphite,…

Quality & Certification

All our products are developed, produced and packed by us, in our own factory, near Lyon using a certified system of quality assurance, SELD is certified ISO 9001, by DNV Certification version 2001 and 2008. All our products and formulations are in accordance with the regulations in force and meet the strictest expectations and obligations. Technical Sheets and Security Data Sheets for all our products are available on this website. All our bactericidal formulations are in accordance with the current European biocides regulations (INRS and MEEDDAT in France). Our biodegradable preparations are formulated according to the most recent European regulations.


All of our product labels meet the new safety standards under the European Regulation : classification , labeling and packaging N° 1272/2008 , said CLP  «Classification , Labelling and Packaging», concerning new security icons. The adaptation of the labels for meeting the new CLP regulations is accompanied by the adaptation of our packaging in multilingual formats for export requirements.
The range is now available in 6 languages : English, French, German, Dutch, Spanish and Italian.

To assure the availability of all MécaTech® products, our commercial policy relies on professional distribution. For instance, in France products are referenced and distributed trough the main distribution networks. In foreign countries SELD has developed a network of exclusive distributors, which is still to expand. All partners and distributors are dedicated to technology and mechanics. They are ready to advise you the best product and the best solution for your application.

We offer you the latest version of our website featuring the full range of MécaTech®products and services.




1965 : A French patent is registered by Mr DAGANAUX n°1448252: « Process of metal treatment with special silicones oils » The commercial brand « DAGANAUX » is registered by Mr DAGANAUD

1971 : The company : « Société d’Exploitation des Lubrifiants Daganaux » (S.E.L.D.) is created at Lyon by Mr. DAGANAUX.

1982 : The trademark « GDA® » is registered with the original GDA® logo.

1986 : M. Henry GAYET (Diesel Engine engineer) takes over SELD with his two sons.

1991 : A complete product line of oil end fuel additives for the automotive maintenance is developed for the ECOTEC Brand

1997 : Thierry GAYET Chemical engineer joins SELD as Full time product engineer.

1998 : Development of the TC Clim spray the first anti-bacteria treatment sprays for automotive air-co systems.

2001 : M GAYET retires and is replaced by Thierry Gayet as company manager

2005 : Certification ISO 9001 certification (Y2000 version)

2006 : The new trademark “MécaTech® Performances” is created all the SELD product will be therefore distributed under the brand.

2007 : Development for Diesel Engines fleet of the “MécaTech® Total Fuel Quality Program”

2009 : MécaTech® Products are referenced by majors distribution networks in France (GroupAuto Union, G-Trucks, Partners, Cap Alliance…)

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