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RALEIGH, N.C. — Representatives of three major truck and engine makers candidly admitted to fleet maintenance directors meeting here that some performance results of diesel particulate filters have not worked out as well as originally anticipated.

Nearly 100 technicians will compete for national honors in truck maintenance next week in Raleigh, N.C., while fleet maintenance directors examine the details of the new federal CSA program, diesel particulate filters and the economic forecast for freight hauling.