Burning questions

The selection of the right oil for a Euro 4 engine is influenced by whether it has selective catalytic reduction (SCR) or exhaust gas recirculation (EGR) emissions control technology. With Euro 4 SCR engines, the demand on the oil is less than with Euro 3 engines as combustion can be more complete, reducing the particulates in the tail-pipe. The EGR system recycles a small amount of exhaust gas back to the engine air intake. This contains soot and acidic compounds, so oils for EGR engines require detergent additives and improved wear and viscosity characteristics. The vehicle manufacturers' association, Association des Constructeur Europeens d'Automobiles (ACEA) oil categorisation sets oil performance standards (called sequences). Oils for Euro 4 and Euro 5 engines are E6 for engines with diesel particulate filters and E7 is for SCR-engined trucks. E4 oils are also compatible with SCR engines. Low-SAPs (sulphated ash, phosphorus and sulphur) E6 oils may not be required for Euro EGR engines without particulate traps.


  • English

Media Info

  • Pagination: 22-3
  • Serial:
    • Publisher: Reed Business Information, Limited
    • ISSN: 0027-206X

Subject/Index Terms

Filing Info

  • Accession Number: 01050821
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jun 5 2007 12:17AM