The 30d engines were Euro 6 compliant from 14 onwards I think but were only put through the Euro 5 tests at the time. I think you can apply manually for the car to be added to the ULEZ compliance A 2023 report by Frontier Economics estimates a manufacturing cost of around £1,740 per car and £10,450 per truck or bus to achieve Euro 7 compliance while the European Commission estimates £

The Greater London Low Emission Zone (LEZ) focuses on reducing particulate matter emitted from diesel-engine vehicles (including hgvs, buses and coaches) throughout the 32 London boroughs and the Corporation of London. The LEZ operates 24 hours a day, 365 days a year and has various compliance stages dependent on vehicle weight and Euro

Hybrid and electric cars. All electric cars are exempt from ULEZ charges. Hybrid cars with a petrol engine must comply with Euro 4 regulations. Diesel hybrids are only ULEZ-exempt if they meet Euro 6 standards. My car was registered on or after the 31st December 1992.
Which cars need AdBlue? Many diesel cars registered after September 2015 use AdBlue to reduce emissions. In general, if you own a Euro 6-compliant diesel Audi, BMW, Citroën, Jaguar, Land Rover
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is my car euro 6 compliant