Thread: Are OZ disco 5 suffering from fuel in oil and early service warning issus?

Originally Posted by guthrie

Going from reports on disco5.co.uk its a known issue.

Have a look at the service notice attached 2017-07 JLRP00100 Service indicator message and oil dilution.pdf

Thanks! Read it all. NOT GOOD!

Reading that service bulliten it sounds to me to be a calculated value.

Originally Posted by meremortal

Not sure - the service rep said mine was the first to come in with the issue and they genuinely weren't sure what the cause was - he intimated it might be "driving style", if that's the case the car isn't fit for purpose. I use it as I have used every car I've ever had. Sometimes short runs 15 minutes or less, sometimes longer from GC to Brisbane or Northern NSW 1 hour or more. I will be researching it more fully once I have the rest of the faults sorted.

So, how many other cars have you had that had DPF, or is this your first? Short runs are killers of DPF and IMHO for a city run around car i belive a petrol engine now will be far better choice. In your case from that sevice bulliten where the very first cause listed for the high dilution is a large number of partial regen cycles so your most likely not running the car hard enough and long enough for effective regen.
Heres an interesting video I found on youtube years ago, talking about DPF operation and how it affects the oil. Also explains a few different regen systems - its not to hard to gues the likely way that land rover has choosen for the regen:
Understanding Diesel DPF Regeneration - YouTube
And another interesting one from "autoexpert". He does bring up some good points in that no dealer sales people mention about the driving styles required for DPF equipped vehicles
The Truth About Diesel Particulate Filter Problems (DPF Problems) | Auto Expert John Cadogan - YouTube

So we have a vehicle that has designed for and has targeted the yuppy townies that only do short runs fitted with an engine that has real problems being operated this way, A pretty Stupid idea don't you think?
If an engine that is virtually new has this oil dilution problem already then it doesn't bode well for the longevity of the engine as this diluted oil will have real problems lubricating the engine correctly and critical damage is an almost certainty if it is ignored.
Personally I wouldn't touch these with a pointed stick until this mess is sorted out.

Originally Posted by shanegtr

Reading that service bulliten it sounds to me to be a calculated value.

So, how many other cars have you had that had DPF, or is this your first? Short runs are killers of DPF and IMHO for a city run around car i belive a petrol engine now will be far better choice. In your case from that sevice bulliten where the very first cause listed for the high dilution is a large number of partial regen cycles so your most likely not running the car hard enough and long enough for effective regen.
Heres an interesting video I found on youtube years ago, talking about DPF operation and how it affects the oil. Also explains a few different regen systems - its not to hard to gues the likely way that land rover has choosen for the regen:
Understanding Diesel DPF Regeneration - YouTube
And another interesting one from "autoexpert". He does bring up some good points in that no dealer sales people mention about the driving styles required for DPF equipped vehicles
The Truth About Diesel Particulate Filter Problems (DPF Problems) | Auto Expert John Cadogan - YouTube

Thanks for the vids I'll have a look when I get a chance.
We've had two diesel cars before this BMW X5 and X3 - neither had this issue. Both driven mainly by my wife. I've always had petrol. This is my first diesel car and my first "luxury" car.

Originally Posted by trout1105

So we have a vehicle that has designed for and has targeted the yuppy townies that only do short runs fitted with an engine that has real problems being operated this way, A pretty Stupid idea don't you think?
If an engine that is virtually new has this oil dilution problem already then it doesn't bode well for the longevity of the engine as this diluted oil will have real problems lubricating the engine correctly and critical damage is an almost certainty if it is ignored.
Personally I wouldn't touch these with a pointed stick until this mess is sorted out.

However as trout says this is a car sold to school run Mum's and real estate agents and everyone in between. If it's not fit for purpose, it's not fit for purpose.

Originally Posted by trout1105

So we have a vehicle that has designed for and has targeted the yuppy townies that only do short runs fitted with an engine that has real problems being operated this way, A pretty Stupid idea don't you think?
If an engine that is virtually new has this oil dilution problem already then it doesn't bode well for the longevity of the engine as this diluted oil will have real problems lubricating the engine correctly and critical damage is an almost certainty if it is ignored.
Personally I wouldn't touch these with a pointed stick until this mess is sorted out.

DPF's are a side effect of increasing emission targets/specs so at this stage without further technology thats what we are stuck with if you want a new diesel vehicle. So really LR is no worse off than everyone else using a DPF. However in my first video I posted there are better ways to activate a regen cycle by using a differential pressure on the DPF and the extra fuel doesnt have to be injected into the cylinders (its jsut conveniant as they are already there), would eliminate unnessasary injection of extra diesel into the engine.
From what I've seen, most cars with DPF mainly just have a blocked DPF warning, not an oil dilution warning - so I'll bet theres a few diesel engines out there that may very well have similar issues, however the owners may have no idea its going on. As the disco warning seems to me to be a calculated warning then you really have no idea if the actual dilution rates are more or less then the specified 6.1% without testing the oil. But yes left unchecked it will have detrimental effects on engine life, however it seems LR has done something to mitigate that somewhat.

Hi Shane,
agree with all your points, as I have been living with EGR, DPF”s, Ad-Blue and all that gear in my work life for 5 or 6 years, what is interesting is a lot of these Discovery’s have been driven
in the UK at motorway speeds and very little short city runs, and have the oil dilution issues with very low miles.

Also from my work life with big diesels, running heavy and hot and long does not make the emission system work any better, if it’s a bad design, it’s not going to give you much joy.

with the emissions laws the way they are, we are stuck with DPF”s and Ad-Blue for the foreseeable future, on the trucks they have made big improvements ( killed off EGR for the time being till 2021 I think )

maybe big petrol engines might make a comeback!

jack

Originally Posted by GP1200

maybe big petrol engines might make a comeback!

Well ... range might be an issue - I came close to buying a Y62 Patrol Ti-L but the economy was 50% worse than my diesel D4s in normal use and much worse in sand. I worked out that to cross the Simpson, to be safe I would need a total of about 300 litres (!!)(yes, 30l/100km), whereas a D4 can do it on about 120 litres.

Check the news and you will see Diesel engines are on death row in Europe. Hard to believe a lot of investment is going into them. Hybrid electric petrols will do well.

Emission regs have created a Frankenstein monster as it is. A VW exec has just just been imprisoned in the USA.

The D5 engines with Adblue etc are the last roll of the dice for diesel imho. More a band aid than a solution.

This is not great for us as we will get what the rest of the world gets regardless of our wide open spaces.

Big V8 petrols have already gone on top end performance cars towards turbo 6’s.

Our current cars could very quickly be a memory just like engines with points and distributors.