(Translated from original letter)

MYTA                                    E50331 ORERA – Zaragoza – (Spain)

25^th January 1999

Dear Sir,

In reply to your request with respect to the certification of the efficacy of your additive service which we have been using since September of 1.997, we would like to show the following facts which we authorise for reference purposes: 

A - Our cogeneration plant is equipped with 2 DEUTZ MWM engines, type TBD 645 L9, with a power of 3,5 Mwe  each one. The engines were put in operation in April - 96 and are using fuel oil nº 1 BIA as fuel.

B - After some adjustments in the operation of the installation carried out between the implementation and the June ’97 inspection, we decided to prevent the corrosion problem of the exhaust valves of the present engines from the beginning of operation.  To this end, knowing the results obtained in the cogeneration plant of MSM, belonging to our Business Group SAMCA, we decided to contract the services of rb bertomeu S.L.

C - Since we began the additive treatment in September - 97 of fuel - oil Nº BIA “rb bertomeu” products beco Mg and later “rb bertomeu” beco F1/ASF, practically all the corrosion problems previously cited have disappeared, which has produced a great saving in maintenance and repair time.

Also we note the disappearance of the serious residual encrustation that was produced in the exhaust valves as well as in elements of the exhaust gas circuit.

D - Finally, we appreciate the technical collaboration that we have received, through assistance in engine inspections, analysis of combustion gases, compilation of follow-up information, etc., all immensely useful for our plant management.