(Translated from original letter)

UFEFYS                                E28300 ARANJUEZ – Madrid – (Spain)

Madrid 30th January 2001

Dear Sir,

We certify that in the Ufefys co-generation plant, located in Aranjuez (Madrid), we have been using “rb bertomeu” additives for fuel oil regularly and without interruption since the beginning of 1996.

After nearly 5 years of using these additives in our fuel oil, especially beco F1/ASF, we are pleased to show our total satisfaction with the technical and economic results obtained from the two DEUTZ engines, type BV 16M 640, in the plant.

As we have said before, the use of “rb bertomeu” additives to treat fuel oil has given us a notable economic benefit through the basic points which are a consequence of various actions on the process:

·      Saving in maintenance due to the great reduction of corrosion in exhaust valves and no corrosion in turbos and inlet valves.

·      An increase in the service of the plant due to the lower number of maintenance and cleaning stoppages, and an increase in the TBO (time between overhauls) made possible by the longer life of the exhaust valves.

The long period of production that the plant has had using these additives is a guarantee, as we understand it, of their quality for this kind of installation.

As on previous occasions, we authorise the use of this letter for reference purposes for your products and services.