Darren. I,m sorry, i,m not trying to confuse you HONEST. Eloy.s are the additive,s, a controlled amount is injected into the fuel tank when you fill up with fuel. Switch on filler cap, tells control unit to measure the before and after gauge reading, to get the correct amount to inject. Eloy,s only do there job ( aid regen) when the particle filter temp.gets raised by a late extra injection of fuel which in effect burns in the exhaust. The regen will only happen at speed due to the heat generated. A forced re-gen is possible with the right scanner (Actia)but only with great care , you could melt the tarmac the car is standing on. HTH Kevin.