US EPA issues final rule on minimum Diesel Exhaust Fluid (DEF) replenishment interval

Rebecca Hayward - 27 August 2014

The US Environmental Protection Agency (EPA) has announced that it has finalized a rule to adopt minimum maintenance intervals for Diesel Exhaust Fluid (DEF). DEF replenishment has been added to a list of scheduled emissions-related maintenance, and has been chosen as an alternative to the previous system of approving DEF maintenance on a case-by-case basis.

For centrally fuelled vocational vehicles, the interval is a 1:1 distance ratio of DEF refill to fuel refill, equivalent to the range provided by the fuel tank size. The same minimum DEF replenishment interval is being adopted for other heavy-duty vehicles, and for light duty vehicles the minimum interval is 4,000 miles.

The maintenance described in the rule includes the adjustment, cleaning or repair of fuel injectors, turbochargers, electronic engine control units, particulate trap or trap oxidizers, exhaust gas recirculation systems, and catalytic converters.

The regulations also allow manufacturers to request a different maintenance schedule or to request new scheduled maintenance that is the result of the implementation of new technology prior to this final rule.

Further information can be found in the US EPA's documentation, here.

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