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What does EU4, EU5 and EU6 mean?

What is meant by EU4, EU5 and EU6 when applied to diesel engines?

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EU4, EU5 and EU6 refer to an engine’s European Emissions Standard. And by this we mean the emissions level a car or van must meet when it’s new. Obviously, the higher the EU rating, the cleaner the engine. When we apply this to diesels things get a little more complicated, because older diesels emit more harmful particles and gases than a petrol. In the future, diesels that don’t meet Euro6 emission standards will be restricted, banned or charged to enter cities in the UK. For more information, see: vans.honestjohn.co.uk/features/what-is-the-ultra-l.../

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