Citroen Eolys Regen question - exhaust gas temps

[CitROeNALD]

I was curious, Citroen and affiliates seem to use the Eolys fluid as a catalyst to aid DPF regens.

From what i understand, the Eolys fluid assists the regen by enabling it to occur at lower temperatures. This should mean that regens can take place on shorter journeys or just take place without having to have very hot exhust gas temperatures.

So....

Does this mean that the advice that you should run the car for a motorway stint at over 2.5krpm for 20+mins every so often to ensure a regen can take place, is less applicable to Citroens with Eolys?

I would therefore assume that as long as a motoway journey that is long enough for a regen, no other preventative actions are needed. No need to keep revs high for a specific length of time etc.

Or, is it just good practice anyway.

Trying to work out the fact from the misinformed fiction.

[RichardW]

The PSA Eolys assisted system works really well. As long as you don't drive exclusively around town it will happily regen in normal driving; and normal motorway driving is probably enough to get it into passive regen. Don't worry about it and just drive it!

[PaulC5]

We've had Citroen diesels with DPFs since 2006 and never had any problems with them or needing to be run at high revs. Just driven them normally, not that many long trips either. Even on motorways they would only run around 2000 rpm at 70 mph.

[CitROeNALD]

Thought that might be the case. I do do a lot of shorter journeys.

I've never had a DPF issue, but I do change the oil often and keep the car well serviced and drive it sympathetically. On most motorway journeys i just cruise at low RPM, often around 1500k ish, and I always wondered if this was enough for the DPF.

So now and then, I have done a 2.5k rpm 20min blast just in case.

But I always wondered with the Eolys if this was even needed and more applied to a VW TDI type engine.

"Even on motorways they would only run around 2000 rpm at 70 mph" Yeh the sweetspot for my 1.6 Blue HDI seems to be 1.5k - 1.7k. Which is ridiculously low.

[pi14]

Hi,

Couple things from my experience based only on driving my C5 X7 2.0 BlueHDI with this system. I bought it as a second hand, did so far approx. 50k km, and the car has almost 190k km.
I installed diode, connected to the side mirror fuse, so I know when the regeneration takes place. So, when I do small distances, the regeneration takes place every 600-700km. When I do some long distance trips, regeneration happens after 1200 - 1400km.
It usually lasts 10-12 minutes.
I usually drive trying to have more than 2000 rpm.
During the regeneration I do not observe the increase of rpm on idle speed, as well as, not higher fuel consumption. The last two things were characteristic for 1.7 TDI engine in my previous Opel Astra J.

Best

[CitROeNALD]

That is very interesting. I was wondering about the indications of a regen with eolys.

It made sense to me that if eolys meant reduce temp regens that you would not get the corresponding increase in fuel consumption and rpm drop, but I could not find any information supporting that supposition.

A lot of the general guidance seems to refer to brands without the eolys system.

[Rp0thejester]

Okay, I need to talk here. I have an 06 C8. Eolys ONLY aids the temperature of a regen as it coats the soot particles before the regen. Town driving will not help the vehicle, you need to 'rag the hell out of it' on motorways. In my car I have to drive at 3k revs before gear change to get the engine upto temperature before the regen will start. Drive it like you stole it!! You'll notice a big difference after the regen.

pi14, that's one of the best engines on the planet imo, 1.7 DTI an Isuzu engine not a Vauxhall/Opal

[pi14]

pi14, that's one of the best engines on the planet imo, 1.7 DTI an Isuzu engine not a Vauxhall/Opal

Correct, that is from Isuzu. Engine - great. But there was DPF ('dry' filter, no additional fluid) ... Some claims that it is to small for that engine, making it regenerate very often! This was not the case in 2.0 put in Insignia. Sorry for the off topic