sourced the bit of info from the dacia forum on the 1.5dci
I got a technical explanation to clarify the DPF mystery in case anyone still has doubts...
On previous generation Nissan 1.5 dci engines, there was a DPF light - this would illuminate if the enginemanagement systemdetermined that the DPF could be blocking up by sensing exhaust back pressure and the history of your driving style (worst case is slow speed, stop-start). The light would come on telling you to drive the car a 'high' speed for a sustained period to increase the exhaust gas temperature and burn off the soot...
On the Euro 5 version (fittedin your Juke, if you have a diesel of course..), there is no DPF light. The engine management system has OCS (oil condition sensing).. this system determines if it believes the DPF may be at risk of being blocked in much the same way, but to regenerate, it does not require you to drive at higher speed for a sustained period. Instead, it uses 2 strategies..
1. Post-injection of fuel - after the main combustion event (the one that creates your power..) there is a small additional injection of fuel that burns into the exhaust, increasing the gas temperature, burning off the soot..
2. The engine is fitted with a 5th fuel injector in the exhaust that pumps fuel into the DPF to raise the temperature and burn off the soot
Both are done regardless of engine/driving speed and are invisible to the driver.
The side effect of the post-injection is that there can be some dilution to the engine oil during regen, and so multiple regens can degrade the oil quality.
The OCS system constantly estimates the reduction in oil performance and calculates the new service interval required.
sounds as if the renault engine has a good system on regenerating the dpf , wasn't trying to scaremonger earlier it is a well known fact, you just have to look around the forums to find them , hopefully this latest innovation has resolved the past problems Edited by: GORDONR