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Diesel particulate filters, a key element of truck emissions systems since 2007, can present fleets with problems if they are not routinely maintained along with the truck’s engine, experts said.

Tom Hassel Transport Inc. has no maintenance facility, and company President Tom Hassel said he is not interested in setting up a shop. Instead, the Point Pleasant Beach, N.J., company leases many of its trucks and plans to phase out the ones it owns.

When A. Duie Pyle needs an engine overhauled or major transmission work done, the company sends the work to an off-site maintenance shop rather than using in-house mechanics.

There’s no real mystery as to why otherwise intelligent fleet operators so often negotiate full-service leases using only big, round numbers. Reason No. 1 is that they simply don’t know their actual, detailed maintenance costs.

TAMPA, Fla. — The Technology & Maintenance Council gave one fleet executive and four associate members its Silver Spark Plug Award for career achievement at TMC’s annual meeting being held here this week.

The 2010 technology power plants and the new emissions systems represented such a dramatic break from the past that only technicians certified by original equipment manufacturers have been able to work on them while they are still under warranty, truck dealers said.

RALEIGH, N.C. — Maintenance directors meeting here shared techniques for combating rust and other forms of corrosion, which they said are a plague to trucks.