AdBlue & SCR Technology

The diesel particulate filter is not the only emissions reduction technology that has been introduced in the last few years. As of 2016, in order to follow EURO VI regulations, all diesel JLR vehicles are equipped with selective catalytic reduction (SCR) systems. SCR uses AdBlue, also known as DEF (diesel exhaust fluid) which is a urea and water-based liquid that is injected into another filter on the exhaust system downstream of the DPF in order to mix with the harmful nitrous oxides in the exhaust fumes and convert them into water, oxygen and carbon dioxide before they are emitted out of the tailpipe.

SCR is quite complex but helps to reduce carcinogenic emissions from diesel vehicles to near zero levels. This system is so tightly integrated into the running conditions of modern diesel engines that if the system does not detect an adequate amount of AdBlue on board, then will disable the engine completely until it detects that the AdBlue has been filled up. AdBlue levels must be monitored in just the same way that fuel levels are, which is why your JLR vehicle will warn you if your AdBlue level is low and will provide an approximate range to empty calculation so you can plan to fill up at an appropriate time.

This table lists the various JLR models using SCR technology, if you own a Jaguar vehicle in particular, please study the table closely before deciding how much AdBlue you require, there are many different variations in tank capacity on Jaguar vehicles depending on model year, fuel tank size and performance.

The general consensus is that DEF is consumed at a rate of 500 miles per litre on average but this can vary greatly depending on driving conditions, driving style and even the weather.

You can top up your DEF fluid using a refill bottle of the correct specification, but it is important not to overfill your AdBlue tank because it may cause the system to malfunction, if this happens, an authorized technician will need to empty the system, clean the internal sensors and reset the system. Further repair work may also be required on an overfilled system if damage has occurred.

Jaguar Land Rover specify that DEF conforming to ISO 22241-1 (DIN 70070) standards must be used on the SCR system of their vehicles, anything that does not meet this specification may cause damage to the catalyst.

YES, AdBlue (DEF) is injected into the exhaust system to assist with the neutralisation of harmful carcinogens, EOLYS fluid is a fuel additive used in wet DPF systems to assist with DPF regeneration, similar to how most DPF systems perform an active regeneration by injecting more fuel. These two products MUST NOT be mixed up and EOLYS is not used at all on JLR vehicles.