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Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re:


Couldn't agree with you more Peter - I think the majority of people's DPF problems in Australia are caused by the dishwater we call "diesel" in Australia - which even after the standards change in 2009 is stillnot up to the standards of Europe - and more importantly, the propensity for some to want to drive their euro diesel like a farm tractor in top gear at low speed. Manual TL/TS drivers take note! Keep the revs up.

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Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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3/Mar/2014, 5:27 pm Link to this post Send Email PM   Send Private Message Blog
 
Drsethl Profile
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Date Registered: 04-2014
TOTAL POSTS: 4
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What, precisely, are the driving requirements for X-trail t31 to clean DPF?


Hi all. I've looked through for some specific details on this, but I have seen a wide range of times, and a wide range of speeds. Can someone tell me whether a journey like this will be enough to keep the DPF clean (it's my commute). 60kph for two km, 80kph for about 9 kilometres, with four or five traffic lights/roundabouts (sometimes green, sometimes red). Then 100kph for 10 km. Then 70 kph for two km. I do that twice a day, will it be enough to reach the required temperature for burn-off? I also do regular longer road trips, but I'd like to know that my daily usage is suited to having a diesel.

Thanks for any advice; I've not been able to translate what I've gleaned from this forum and google into my specific case, and I don't expect the dealers to be particularly well informed on this.

Cheers
Seth
7/Apr/2014, 11:06 am Link to this post Send Email PM   Send Private Message Blog
 
Toddyh03 Profile
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Date Registered: 08-2011
Location: Lalor Park, NSW
TOTAL POSTS: 1663
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Re: DPFs


Your 80km/h and 100km/h sections will be plenty for the burn. Just leave it in 4th @ 80km/h and 5th @ 100km/h every few days to make sure.

---
Toddyh X-2048 (c)
New: Challenger
Old: 2010 T31 Diesel modified
My XTrail
7/Apr/2014, 11:10 am Link to this post Send Email PM   Send Private Message Blog
 
Drsethl Profile
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Date Registered: 04-2014
TOTAL POSTS: 4
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You're a legend mate, that sets my mind at rest.
7/Apr/2014, 8:49 pm Link to this post Send Email PM   Send Private Message Blog
 
Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re: Re:


Agree with Toddyh - the important thing to promote an effective DPF regeneration is to get the exhaust gas temperature up. The only way to do that is to keep the revs up. And a secondary effect of keeping the revs up is that the fuel will burn cleaner, producing less diesel smoke which in turn reduces DPF soot buildup and less sooting of the EGR valve.

I drive 47km (return) to work every day on mostly 80-100kmh sections, and about 10km at 110. Even at 110, the automatic gearbox does not select 6th gear (6th gear doesn't select until about 113ish with low engine load) and thus on the Federal hwy I'm normally doing 110 in 5th gear which equates to about 2500RPM. This been very effective in keeping the EGT up and ensuring an effective regen every time. And I still average 7.5-7.6l/100km so letting her 'sing' doesn't affect fuel economy.

The secret with this engine is to let it rev. It's French - it was designed to! Driving it like a tractor in 6th gear at speeds below 110 is inviting the DPF light or worse, the dreaded MIL light.



Last edited by Exywarrior, 7/Apr/2014, 11:15 pm


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Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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7/Apr/2014, 10:59 pm Link to this post Send Email PM   Send Private Message Blog
 
konazz Profile
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Date Registered: 08-2012
Location: Canberra, ACT
TOTAL POSTS: 479
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Re:


I got an email recently from Western Filters that they're doing DPF cleans... interesting?! Anyone heard about this. I don't need one at the moment, but a bit of preventative maintenance can't hurt

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Michael K
2012 X-Trail Series IV Diesel TS
Member X-2600 (C)
Mods: Pedders Lift Kit, Bash Plates, 16" X-trail Steel Rims, 235/70/16 A/T Tyres, Heavy Duty shock absorbers
5/Jun/2014, 7:51 pm Link to this post Send Email PM   Send Private Message Blog
 
Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re: DPFs


Hi Michael,

Yes it is interesting news from Western Filters although I have read several British car maintenance firm websites tha have been doing DPF cleans for a while. I guess they've had DPFs in service in Europe and the UK for longer than Australia.

Might be definitely worth a try for those who do a lot of city driving or a lot of driving in high gear at low speeds.

Since starting the new job at the beginning of this year I've seen far fewer DPF regens and I put it down to the long periods of 90kmh+ on a daily basis. The M9R definitely loves the highway speeds.

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Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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22/Jun/2014, 11:22 pm Link to this post Send Email PM   Send Private Message Blog
 
konazz Profile
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Date Registered: 08-2012
Location: Canberra, ACT
TOTAL POSTS: 479
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Re:


Yeah... probably not for me. I've done 90,000kms - no DPF light ever, and only 1 regen (after 2 days of 4WD'ing, I hit the highway and the car went into a burn)

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Michael K
2012 X-Trail Series IV Diesel TS
Member X-2600 (C)
Mods: Pedders Lift Kit, Bash Plates, 16" X-trail Steel Rims, 235/70/16 A/T Tyres, Heavy Duty shock absorbers
12/Jul/2014, 4:03 pm Link to this post Send Email PM   Send Private Message Blog
 
dannydesch Profile
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Date Registered: 07-2009
Location: ACT
TOTAL POSTS: 9
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Re: DPFs


Hi guys,

I've been reading this thread with interest as I've just had to drop $4,200 to get my DPF replaced after they failed to clear it using "forced regeneration" which lasted a whole day! My T31 is from 2009 so I was not expecting this at all.

Dealer said it was probably due to our 'driving style' but we're driving it fairly 'dynamic', we're in Canberra so plenty of sections of 80km/h and a good stretch of 100km/h once in a while, suburbs are a fair distance apart so I don't take the argument that we drive it for too short distances and in too high a gear, as the mechanic suggested.

Question for you guys: has anyone succeeded in getting their money back/have the DPF replaced for free? A lawyer friend of mine told me the Australian Consumer Law (specifically the consumer guarantee) requires the seller to fix the problem for free if it did not meet reasonable standards of quality and durability.

Sure enough replacing an oil filter does not fall in this category, but the mere fact that the DPF is meant to clean itself AND costs that much means it is clearly designed to last well beyond 5 years - I think the UKAA article at the start mentioned 75K miles at minimum.

Many thanks!

Danny

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Danny
2009 X-trail LT, White Diamond.
16/Jul/2014, 1:50 pm Link to this post Send Email PM   Send Private Message
 
Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re:


Hi Danny.

I had my DPF replaced under warranty for free. The car was at time 18 months old. It is now 15 months since the DPF was replaced. It was reportedly defective from new, hence they never argued. I think it also helped that my car has always been serviced by a Nissan dealer so they didn't have any cause to argue.

You don't mention in your profile whether your TL is a manual or an auto. However driving the M9R diesel in too high a gear is most definitely a catalyst for early DPF failure. Driving at too low engine revs causes the exhaust gas temperature to drop and that reduces the effectiveness of the fuel burn and carbons up the DPF a lot faster. So in essence, your mechanic is right in what he said.

One of the biggest differences in driving habits between us and Europeans (the M9R diesel is a Renault in disguise and therefore loves freeway speeds), is that Aussies tend to drive their manual cars like tractors by using high gears at low speeds. In a DPF-fitted car that's exactly the wrong thing to do. The guidance I was given by a very knowledgeable Nissan mechanic is that you must, so far as possible, keep the RPM above 2000. This keeps the EGT up and enables the DPF to function more efficiently. I have an auto TL and it doesn't reach 6th gear until 112-115 kmh so I actually spend a great deal of time in only 5th gear. At 100kmh the engine is revving around 2,200RPM.
 
Now some will argue that doing this kills the fuel consumption but they're wrong. I'm driving 100km/day between Canberra and Bungendore every day and I am averaging 7.2/100km which is well inside the brochure spec of 7.4.
I'm lucky if I see a DPF regen once a month. Sometimes twice a month.

The M9R has a variable geometry turbo which works on engine vacuum to determine the boost and to get the turbo really working efficiently and the engine 'breathing', you need to give the throttle a bit of boot. This was something else my mechanic told me and I have become a true disciple of this. Getting the turbo really going seems to make a huge difference to the engine's efficiency and I think it actually improved fuel economy.

The other thing that kills DPFs is bad diesel, watery diesel or diesel with high sulphur content. Until later 2009 our diesel in Australia averaged up to 30ppm Sulphur which was 3 times the sulphur in European diesel. Sulphur is bad for DPFs as it makes the fuel burn dirtier and causes more soot/smoke, requiring more DPF regenerations. From late '09 the Aust Standard for fuel changed to 10PPM maximum and this is closer to the European spec.

While I sympathise with you having to replace the DPF and I don't know enough about how you drove the car before the DPF failed, unfortunately DPFs in all such-fitted cars are unforgiving to those who don't let the engine sing and give it a chance to get hot enough. They also really, really hate poor quality fuel. Hence I only ever buy Caltex Vortex premium or BP Ultimate Diesel (the latter is not available in Canberra).

Some brands of DPF-fitted cars get as much as 250,000km out of one DPF.

One thing's for sure - I will definitely be getting my DPF and EGR Valve checked before the warranty runs out. But thus far, I've had no problems.

I don't know if any of this answered your question...but if your warranty is out then I don't think you've got much of a chance of getting your money back, unfortunately.

---
Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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19/Jul/2014, 1:18 am Link to this post Send Email PM   Send Private Message Blog
 


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