If I open the cover of the ccv, as u said if the spring is saggy or the membrane is too hard then it needs replacement; right?

It appears like this one may be opened. Peugeot moved to favouring incorporated in the valve cover, and not 100% sure which type this is, just suspect it is one that can be opened. My for instance, is incorporated in 2013 and even earlier models of the 4007 but has oil decanter system as well.

Frequent regeneration of the dpf can dilute engine oil and it also cause too much consumption.

off the top of my head,

The DPF is after the engine, and I'm not sure how regeneration aides dilution of the engine oil. The system for DPF regeneration is largely passive on Peugeot. An additive is mixed with the fuel, which lowers the required regeneration temperature, which accumulates in the DPF. Then assuming the temperature is reached, and other burnable material present, it burns. There are certain materials which won't burn also collected, the additive packages contained in the engine oil (to name, is one source).

Engine oil dilution is usually from mixing with diesel fuel, this could be from a defective CCV, oil control rings, excessive blow-by (turbo or compression ring issue), problems with the diesel injectors. (not tried to cover every source, just likely ones, and this process is normal as well, why oil needs to be changed in any turbo diesel, more than naturally aspirated diesel)

If you have excessive oil entering the DPF, would be thinking about the turbo, this is usually how they die, dumping engine oil into the exhaust from the turbo bearing.

Diesel Smoke Diagnosis Guide - White, Grey, Black, Blue - learn diesels
DPF Regeneration Fluid (Eolys) in PSA Engines: A Guide for Professional Mechanics | JLM Lubricants

Hope you find this useful.

 

The CCV is under this, circled in red, it is a spring with soft membrane. The electrical connector is a heater which stops condensation forming from oil / water vapours that come through from the CCV. The flow is in the direction arrow given.

I don't see an oil decanter system at this stage, but I do see some suggestive signs the CCV is most likely worn, you would need to check in the intake nearest the turbo for excessive oil, the oil if present will pool in the intercooler or lowest intake pipe. The wearing of the CCV is the spring may sag, and/or the membrane becomes hard and/or breaks/cracks.

Hope you find this useful.

 

Thank you, your reply covers a lot which i wanted to know.

I did check the intake between turbo and airbox. It contain signs of oil but not excessive. I haven’t check other the intercooler and lowest intake pipes.

If I open the cover of the ccv, as u said if the spring is saggy or the membrane is too hard then it needs replacement; right?

Btw, the excessive oil consumption could be due to the age of the DPF in my age. Milage is 260k km and recently I had it professionally cleaned but still it seems it needs to be replaced. Frequent regeneration of the dpf can dilute engine oil and it also cause too much consumption.

 

Can't tell you anything else with the cover on.

 

 

Thnx for the reply. Currently I haven’t got cover off photo. Would this do for the time being?

For the purpose of the above mentioned oil issue, does the ccv or decanter system have a valve like the one in pcv system which could be taken out and cleaned/replaced?

 

Take a photo of the engine with the cover off and post it. You will have CCV and possibly an oil decanter system, no PCV on any Peugeot diesel.