Using 2ltr of oil every 1000miles now DPF always full

[awdv70]

My dads V70 d5 2006 e4 has been getting worse, it started using more oil to the point that it is 2 litres per 1000 miles, no signs of leakage, did have a spray on the inlet side of turbo but tightened hose up and fine since, though oil use worse. The car has always smelt crankasey, though the glove test is fine for suction. Also the mpg has dropped from 42 to 35, now the dpf is constantly re filling, despite plenty of heat through it.
I have a generic elm ob11 with torque, showing dpf and maf codes , but I know they are not specific.
I am looking to get the piston pressures read to see if that is were the oil is going! I am hoping it is something simple like a faulty dpf differential pressure sensor(ordered), as clan mentioned it has similar symptoms. Other wise turbo seals or vale stem guides.
Does anyone else have experiance of these symptoms. I have read hours worth of threads.

Thanks.

[ukdido]

You need Vida first to find out any code.

[awdv70]

Thanks. I am off to see a member with vida this evening, so hopefully it wont be all bad news.

[awdv70]

Thank you Petey80 for the help with vida, and sorry for the slow reply. I slipped a disc in my back, whilst unnecessarily removing the lower retaing bracket off(down below the turbo) for the pressure pipe, to the dpf sensor.
If its any help, the sensor comes off the pipe quite easily, by working a small screwdriver in around the edge of the rubber pipe to free it. And the replacement just pushes back in.
Well replacing the dpf sensor did not help with the problem. Vida had said the dpf only had 1.5g of soot in it, but the pressure was reading 30hpa at idle.
In the end we took it to a local volvo indy, who had come across a few v70's with this high oil use/low mpg issue, they said it would be full of ash from the oil which cant be burnt away. So they replaced the whole dpf.
So far, it seems it has cured the low mpg, as is back up over 42 from 34 . to early to tell on the oil consumption, but it does not smell oily like before. Fingers crossed thats all it was and not the valve stem guides or piston rings(though some folk have said they dont have rings?)

[Dougiethediver]

Originally Posted by awdv70

Thank you Petey80 for the help with vida, and sorry for the slow reply. I slipped a disc in my back, whilst unnecessarily removing the lower retaing bracket off(down below the turbo) for the pressure pipe, to the dpf sensor.
If its any help, the sensor comes off the pipe quite easily, by working a small screwdriver in around the edge of the rubber pipe to free it. And the replacement just pushes back in.
Well replacing the dpf sensor did not help with the problem. Vida had said the dpf only had 1.5g of soot in it, but the pressure was reading 30hpa at idle.
In the end we took it to a local volvo indy, who had come across a few v70's with this high oil use/low mpg issue, they said it would be full of ash from the oil which cant be burnt away. So they replaced the whole dpf.
So far, it seems it has cured the low mpg, as is back up over 42 from 34 . to early to tell on the oil consumption, but it does not smell oily like before. Fingers crossed thats all it was and not the valve stem guides or piston rings(though some folk have said they dont have rings?)

I posted about my V70 using 4 litres oil every 1000 miles Fri 17th and "outnumbered" has guided me to your post. My DPF was replaced and the car was ok for a short while but then went into almost permanent "limp mode" and now I've taken it off the road until I can sort the problems. Like you I am thinking valves and/or pistons and would appreciate an update as to what you are doing/thinking

[john493]

Originally Posted by Dougiethediver

I posted about my V70 using 4 litres oil every 1000 miles Fri 17th and "outnumbered" has guided me to your post. My DPF was replaced and the car was ok for a short while but then went into almost permanent "limp mode" and now I've taken it off the road until I can sort the problems. Like you I am thinking valves and/or pistons and would appreciate an update as to what you are doing/thinking

Sounds like the DPF is not regenerating. Your car was ok until the new DPF became clogged & needed a re-gen.
It's the pressure sensors that tell the ECU when a re-gen is needed and the temp sensors when to start it, i.e. the car is fully up to temp. These need checking with VIDA.

[BillDD5]

Originally Posted by awdv70

My dads V70 d5 2006 e4 has been getting worse, it started using more oil to the point that it is 2 litres per 1000 miles, no signs of leakage, did have a spray on the inlet side of turbo but tightened hose up and fine since, though oil use worse. The car has always smelt crankasey, though the glove test is fine for suction. Also the mpg has dropped from 42 to 35, now the dpf is constantly re filling, despite plenty of heat through it.
I have a generic elm ob11 with torque, showing dpf and maf codes , but I know they are not specific.
I am looking to get the piston pressures read to see if that is were the oil is going! I am hoping it is something simple like a faulty dpf differential pressure sensor(ordered), as clan mentioned it has similar symptoms. Other wise turbo seals or vale stem guides.
Does anyone else have experiance of these symptoms. I have read hours worth of threads.

Thanks.

I had the same symptoms with my V70 D5 E4; a rising oil consumption but it was accompanied by an increase in fuel consumption too. It was basically engine wear that had been accelerated by the DPF constantly regenerating. I worked out that the engine was badly worn owing to: a) high mileage >250k miles and b) It should have had more frequent oil changes - 18k miles between oil changes is too much, in my opinion. There were no 'faults codes' when read but it was constantly showing the 'Soot filter full' message and would go into limp mode if made to work hard. Eventually the DPF would clear itself but the problem became increasingly bad. Gave up on it in the end.

[Dippydog]

As I understand it the dpf gradually fills with soot which then triggers[under certain conditions] a re-gen where the soot is burnt off[or you can "force"a re-gen]however every time a re-gen is completed it leaves an ash which the re-gen can't burn and the dpf gradually fills with this ash,hence the need to periodically remove the dpf and clean it of this residue.Whether this ash build up would cause oil consumption problems I don't know.

[Leyburn]

Does VIDA record when a regen occurs?

My understanding is that the DPF can be cleaned in four ways:

Frequent motorway use
Regen triggered by the ECU
Forced regen
Manual cleaning

[awdv70]

Hi Doug did you get sorted. Ours is still going fine but smelly, only done 4000 miles but oil level not dropped to critical yet, though it is using some(probably nearly a litre by now). I suspect the indy put a thicker oil in as it smells a lot richer.
Did you change the pressure sensor and pipes to it, as they may be faulty/clogged.
I havent looked into it further, but vida said the piston pressures were pretty spot on, it measures the injector rate, so if they are off it may mean the piston chamber pressure is high/low. On ours it maybe(I dont know) the valve stem guides going, seeping oil, as once noticed smoke after a long down hill coast.

I think dippydog is right about the ash turning to soot during regen, the soot is the problem as it builds up and stops the exhaust system breathing, hence it increases the back pressure back into the engine, which causes oil to be forced into the piston chambers, drinking more oil and clogging the dpf a lot more.
The fall in mpg maybe also due to the back pressure, as the engine is working harder.
I would think if the D5s were not always driven for fuel economy(my dads fixation) they may clean themselves out better(passive regen) I think the triggered regens that just add fuel after combustion, idealy need to be synced with a high air flow.
Leyburn , you are right, though any safe road will do,just keep your revs around 3000 for 10/15 minutes. Have heard cleaning via removal is tricky due to right angles in the dpf, some garages have shaking machines to help.
Without trying to spread fud, I have heard that some aftermarket fuel addatives can strip the passive regen coating off the dpf, I had been using one, but it is speculation.