- harrythespider
- Member Since: 19 Jul 2018
- Location: cumbria
- Posts: 417
Oil Dilution
I am considering purchasing a used Disco 5, 3.0l V6, but have come across various posts highlighting oil dilution, the cosequential too frequent oil change requirements and ultimately possible engine failure. If I understand the problem correctly, the non or interrupted regeneration is due to insufficient heat in the DPF due to either short journeys or the length of the exhaust system pre DPF. If the issue is the cars software deciding that regeneration has not occurred (due to the above) why cannot the DPF be forced to cycle with an auxillary heat source, (induction coil or similar), activation could be easily controlled by suitable hardware/software. Too simple??????
Comments please.
- harrythespider
- Member Since: 19 Jul 2018
- Location: cumbria
- Posts: 417
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Thanks Indus D4!!!! 27 pages,, almost lost the will. Conclusion.. early oil change/adblue use/ oil dilution is due to extended positioning of DPF etc system and consequently not reaching the required regen temperature for appropriate time period, coupled to increased diesel injection and ignition timing changes,
Does that mean I was thinking correctly in my posting?
- simonh
- Member Since: 02 Apr 2017
- Location: Shropshire
- Posts: 1002
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It’s a design issue / fault. Same as with the 2L diesel Disco Sport.
I rejected my DS due to this plus many other issues I had with the car.
Velar HSE D240 - MY19
Served by the excellent Shukers Land Rover of Ludlow - 10 Land Rover’s and 20 years of amazing customer service.
- AndrewS
- Member Since: 28 Apr 2016
- Location: Pembridge
- Posts: 410
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My 17my 3L V6 is on 20k and it has not suffered these issues.
- IndusD4
- Member Since: 28 Jan 2018
- Location: Sydney
- Posts: 698
You could go for the 2.0L diesel which has no reported oil dilution issues. In a Volvo you would get a 2.0L diesel as well - no 3.0L option.
Ron
2016 D4 TDV6
IIDTool BT
- JonM
- Member Since: 30 Jun 2016
- Location: North Yorkshire
- Posts: 598
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Just out of interest, I've got a 2018 3.0 TD6 for.a couple of days while my D4 is having some work done at the dealer's.
The car has done 5000 miles and the service screen shows 11000 to the next service and 8000 to Adblue top up. So it looks like this car isn't suffering from the oil dilution problem.
MY2022 D5 HSE D300 - with extra nice bits added
MY2019 D5 HSE 3.0 SDV6 - sold to a dealer for a crazy price!
- Trevorb1
- Member Since: 08 Jan 2018
- Location: Nuneaton
- Posts: 284
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JonM, with those quoted mileages I would bet that that car has recently had an oil change and adblu top up. My first oil change done at 5200 miles and then it said distance to next service 10800, making 16000 service, since then the mileage to next service is coming down at over twice the rate of accumulating mileage and its now calling for another oil change in 1700 miles @ 9200 miles completed, so I'll be looking at se ond oil change around 10000 miles.
Average distance for oil changes seems to be circa 5000 miles, but it does vary by driving style from that.
24MY D300 Dynamic SE, Fuji White, Deployable Towbar, full size spare.
Gone 20MY SDV6 Landmark, Indus Silver, Deployable Towbar, 360 Cameras
- harrythespider
- Member Since: 19 Jul 2018
- Location: cumbria
- Posts: 417
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I'm still deliberating over getting a D5, but FIO is a concern. Most used D5's would still be covered by warranty, but premature oil changes not covered, significantly increase the running costs. If I understand the problem, the regeneration is triggerd by post injection of fuel during the exhaust stroke and some of the deisel is scraped by the piston rings into the sump resulting in oil dilution. Surely an easy fix would be to place a supplementary 'injector' into the exhaust manifold system external of the head therefor no oil can enter the sump but raises the fuel content in the DPF to trigger regeneration. Its got to be a cheaper fix than a new engine!!
- simonh
- Member Since: 02 Apr 2017
- Location: Shropshire
- Posts: 1002
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Get the 2L. Gem of an engine. No dilution issues. Mines just had its first service at 21K miles. No interim oil service required.
Velar HSE D240 - MY19
Served by the excellent Shukers Land Rover of Ludlow - 10 Land Rover’s and 20 years of amazing customer service.
- Flat Earther
- Member Since: 15 Dec 2016
- Location: England
- Posts: 73
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I’d really like to know more about why LR injects the additional diesel into the combustion chamber, rather than into the exhaust manifold area.
Can anyone with specialist knowledge shed any light on this, or provide a link please?
- andynoiseboy
- Member Since: 26 Aug 2018
- Location: West Yorkshire
- Posts: 36
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I believe that's because an entirely separate injection system would be required, adding cost and additional design work on an older engine design. In some respects, it's a work-around to try meet EU6 regs so not ideal. I won't use the word 'bodge'..... oops....
- IndusD4
- Member Since: 28 Jan 2018
- Location: Sydney
- Posts: 698
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To make the exhaust gasses hotter so they burn off the soot in the DPF. So you need to burn more diesel to make that happen, injecting it in the exhaust manifold would not help one bit.
Ron
2016 D4 TDV6
IIDTool BT
