Recital 11

(11) Compression-ignition engines are inherently durable and have demonstrated that, with proper and effective maintenance, they can retain a high level of emissions performance over the significantly high distances travelled by heavy-duty vehicles in the course of commercial operations. However, future emission standards will push the introduction of emission control systems downstream of the engine, such as deNOx systems, diesel particulate filters and systems that are a combination of both and, perhaps, other systems yet to be defined. It is therefore necessary to establish a useful life requirement on which to base procedures for ensuring the compliance of an engine’s emission control system throughout that reference period. In establishing such a requirement, due account should be taken of the considerable distances covered by heavy-duty vehicles, of the need to incorporate appropriate and timely maintenance and of the possibility of type-approving category N1 vehicles in accordance with either this Directive or Council Directive 70/220/EEC of 20 March 1970 on the approximation of the laws of the Member States on measures to be taken against air pollution by emissions from motor vehicles (8).

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.