# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 4.1.5: Oil level and conditioning

Extent: E+W+S+N.I.

The oil level or filling volume shall be set to the maximum level as defined in the manufacturer's maintenance specifications.
An external oil conditioning and filtering system is permitted. The axle housing may be modified for the inclusion of the oil conditioning system.
The oil conditioning system shall not be installed in a way which would enable changing oil levels of the axle in order to raise efficiency or to generate propulsion torques in accordance with good engineering practice.

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/VII/division/4/division/4.1/division/4.1.5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-VII/division-4/division-4.1/division-4.1.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.