Houston, Tx., December 8, 1999 - Conoco (NYSE: COC.A) (NYSE: COC.B) today announced an alliance with Dingo Maintenance Systems, a leading supplier of Oil Analysis software. Under the terms of the agreement, Conoco and Dingo will jointly offer US, Canadian and Mexican customers in the mining industry a tailored program to improve the effectiveness of their oil analysis programs. Much like the human equivalent of a blood sample, Oil Analysis is a widely used predictive maintenance technique in mining, where samples of a machine's oil are analyzed to determine equipment health problems.

Dingo's latest software technology allows oil analysis professionals to establish intelligent rules to enable the automated generation of machine specific maintenance responses to oil sample data. Through integration, these actions can be posted directly into a Work Order Management System. Conoco's customers now have an additional tool in their kit to streamline maintenance using information technology.

"Many companies are already doing oil analysis, but clerical paperwork and administration clogs up the decision process. This limits the effectiveness of the whole Oil Analysis program," said Chris Beasley, Sales Manager for Conoco's Lubricants and Specialty Products group. "Dingo's Software takes the hassle out of data management so that busy mine maintenance people can make a better decision, in less time."

Dingo Lube Professional is a comprehensive Oil Analysis management system designed by Maintenance and Information Technology Professionals to manage the entire oil analysis program - from the time samples are taken through, to recommending the correct maintenance action to be taken. The system includes Sample Management, Exception Analysis, Trend Graphs, Expert Alarms, User and Statistical Alarm Limits, Equipment and lubricants database, History, Fuel and Oil recording, Reports and Utilities.

Conoco is a major, international energy company, based in Houston and active in 40 countries.

Dingo's software products include Dingo Lube Professional, Dingo FleetOil Professional for Windows, Dingo Lube Explorer, and Dingo Lab Manager. Dingo's customers include Alcoa, Ansett Australia, Chicago Transit Authority, NASA, New York Times, Illinois Power, Peabody Coal, Rio Tinto, Lake Superior Paper, and Caterpillar dealerships in Australia and the United States. Dingo also conducts oil analysis education and is the Licensed Noria franchisee for Asia Pacific.

Contacts:
Paul Higgins, Dingo Maintenance Systems, Inc.
(303) 662-9103
phiggins@dingo.com

Brent Green, Brent Green & Assoc.
(303) 743-0140
brent@bgassociates.com