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You're viewing: What is the difference between Euro 5 and Euro 6 Engines

What is the difference between Euro 5 and Euro 6 Engines?

European emission standards define the acceptable limits for exhaust emissions of new vehicles sold in the European Union. As a member of the EU (for the time being at least), the United Kingdom is obliged to introduce Regulation (EC) No. 459/2012. This legislation requires vehicles to have an engine which meets certain environmental standards in order to reduce atmospheric pollutants such as particulates and nitrogen oxide. The first standard was introduced in 1993 (Euro 1), we are now moving to Euro 6.

Euro 5 and Euro 6 are European emissions standards that regulate the acceptable limits of exhaust emissions from new light duty vehicles sold in the EU and EEA.

The main difference between Euro 5 and Euro 6 is that:

Euro 5 engines focused largely on carbon dioxide emissions (CO2), while Euro 6 is primarily focused on reducing nitrogen oxide emissions (NOx).

Euro 5 engines required all diesel cars to have particulate filters (DPFs) to trap microscopic pieces of soot, while Euro 6 engines made selective catalytic reduction (SCR) or AdBlue systems mandatory for diesel cars to reduce NOx emissions.

Euro 5 engines were introduced in September 2009 for new models and January 2011 for all new cars, while Euro 6 engines were introduced in September 2014 for new models and September 2015 for all new cars.

Other gases are also lowered by both standards, such as CO2, carbon monoxide (CO), hydrocarbons (HC), sulphur dioxide (SO2), and diesel particulate matter (PM).

Different manufacturers are tackling these standards in different ways

Comparison of Euro 5 and Euro 6 emission Standards

	Euro 5	Euro 6
Introduction Year	2009	2014
Particulate Matter (PM) Limit for Diesel Cars	0.005 g/km	0.005 g/km
Nitrogen Oxides (NOx) Limit for Diesel Cars	0.180 g/km	0.080 g/km
Particulate Matter (PM) Limit for Petrol Cars	Direct injection petrol engines: 0.005 g/km	Direct injection petrol engines: 0.005 g/km
Nitrogen Oxides (NOx) Limit for Petrol Cars	0.060 g/km	0.060 g/km
Mandatory Equipment for Diesel Cars	Particulate filters	Particulate filters and Selective Catalytic Reduction (also known as ‘AdBlue’)

Euro 5 Engine

Every van registered from October 2009 onwards has had to meet the current Euro 5 standard which states the maximum limits of NOx and CO2 that are permissible. Euro 5 engines focused largely on carbon dioxide emissions.
Euro 6 Engine

Euro 6 is primarily focused on reducing nitrogen oxide (NOx) emissions. Other gases are also lowered, such as CO2, carbon monoxide, sulphur dioxide, and diesel particulate matter emissions. Different manufactures are tackling these standards in different ways.

For example, DAF new range of CF and XF Trucks are all Euro 6 engines.

Ford, also have an all new Euro 6 engine for the Transit and Custom which replaces the old 2.2-litre diesel, bringing increased power, a wider spread of torque, and a 13 percent increase in fuel economy.
Check out the Euro 1 to Euro 7, a complete guide on emission Standards

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