Mazda 6 2.2 diesel - owner wanted to return car

FGR

Apologies to the Mods as I'm trying to locate a specific thread about the above topic.

There was a poster who had an issue with their Mazda 6 that they had bought new but the DPF began giving awful trouble to the extent that diesel was mixing with the oil in the engine. He was trying to resolve the matter but the lockdown stopped things.

Does anyone remember the thread or has it since been deleted? I'm interested in it and was hoping to see if there was a resolution.

If it's been deleted then I hope that means it's a happy ending.

Hopefully it's ok to post this as I can't find the thread via the search function or from my own posts in the thread. Thanks!

Psychedelic Hedgehog

It was deleted upon advice received by the OP from their own legal representation. I'm curious myself as to how it ends up.

FGR

Thanks for that PH - fingers crossed the OP gets a result that suits.

I often wonder will DPFs/GPFs be the downfall of ICEs.

Do Hybrids have them?

Psychedelic Hedgehog

I wouldn't be surprised to see PPF/GPF's introduced on hybrids, as I think newer VW's and other marques are introducing them already.


I have a bit of skin in the game myself as I own a Mazda6 2.2D, which does require more frequent servicing than other diesels (which I don't really mind as I've always treated frequent oil changes as an investment in an engine's longevity). That person's situation was well beyond acceptable, however.

road_high

Would love to know how it turns out too.

Old diesel

FGR wrote: »

Thanks for that PH - fingers crossed the OP gets a result that suits.

I often wonder will DPFs/GPFs be the downfall of ICEs.

Do Hybrids have them?

To be fair other makes of car dont have DPF/GPF issues to the extent Mazda's have.

Mazda have poor DPF processes and my uneducated understanding is that the car injects extra fuel during DPF regeneration

However if you have uncompleted regeneration of the DPF that extra diesel can escape into the sump.

Other makes can give DPF issues but the outcomes are usually much less severe then the Mazda and owners have a better chance to manage DPF regens by going for longer drives.

ofcork

Have a 2012 avensis diesel never had a dpf issue never even noticed it regenerating.

CoBo55

ofcork wrote: »

Have a 2012 avensis diesel never had a dpf issue never even noticed it regenerating.

I drove one for years and never noticed any difference in the way it ran either, thirsty fecker though (compared to modern diesels), blew the head gasket which signed her death warrant...

ba_barabus

ofcork wrote: »

Have a 2012 avensis diesel never had a dpf issue never even noticed it regenerating.

It's a different system. I've one too

Leonard Hofstadter

Almost all other diesels don't inject diesel into the sump when there is an incomplete DPF regeneration. That's the difference between their systems and Mazda's.

That's not to say you won't get DPF issues in other cars, but it's much cheaper to repair and doesn't have the potential to destroy the engine.

There aren't any known issues with PPFs (petrol particulate filters) that I'm aware of.

sumo12

ofcork wrote: »

Have a 2012 avensis diesel never had a dpf issue never even noticed it regenerating.

Yes they do. Generally trouble free on the 2.0 until 250k, then chuck the DPF in the bin. Replace DPF and pipes and clean sensors and you're good to go again. New DPFs cheap enough from Toyota too IIRC

zilog_jones

Leonard Hofstadter wrote: »

Almost all other diesels don't inject diesel into the sump when there is an incomplete DPF regeneration. That's the difference between their systems and Mazda's.

It's not "injecting diesel into the sump", it's the normal fuel injectors in the combustion chambers. Late injection, or injection during the exhaust stroke is a fairly common method of increasing exhaust temperature for active DPF regeneration (there are some but not many alternative methods). The problem by doing this is the potential for unburned diesel to remain in the cylinder, get past the piston rings and into the crankcase.

Oil dilution is not an unheard of problem with diesel engines, but I don't know what it is exactly about the Mazda SkyActiv-D engines that makes them more prone to this. They do use lower compression than what is typical for modern diesels, but I don't know if that's a contributing factor.

One of the big things they tried to do was achieve Euro 5 emissions standards without selective catalytic reduction (AdBlue or whatever), so they probably did a few things differently compared to the competition. Obviously, it didn't go well.

Regarding petrols and particulate filters: Petrol engine exhaust temperature is typically higher than diesel so the conditions for passive regen should be easier to meet on a regular basis.

I believe it's only some direct engine petrols that are getting particulate filters due to their higher particulate emissions. A lot of petrol hybrids currently out there are still using indirect injection, e.g. the current engine in the Prius and 1.8 Corolla Hybrid (2ZR-FXE).

TheGreatUnkown

Sorry just saw this.

Managed to get my money back thank god. Glad to put this experience behind me, it was a complete nightmare.

I was reading through some Mazda threads and I noticed that some people were saying that Mazda diesels don't give issues if driven on motorways. From my perspective, I can tell you that this is NOT the case. A disaster of an engine.

Have a loan of a friend's car and I can tell you it is great to be back in a petrol car again. Will have to sort out another car in the new year, but it won't be a Mazda that's for sure.

zilog_jones

zilog_jones wrote: »

.....

One of the big things they tried to do was achieve Euro 5 emissions standards without selective catalytic reduction (AdBlue or whatever), so they probably did a few things differently compared to the competition. Obviously, it didn't go well.

R.......

I've a 2018 Euro 6 sorento that doesn't have
selective catalytic reduction..... Must be some effective exhaust gas recirculation system but it's not Mazda 6 ish anyway.

ofcork

Great news you got your money back alot of hassle to go through .

bazz26

TheGreatUnkown wrote: »

Sorry just saw this.

Managed to get my money back thank god. Glad to put this experience behind me, it was a complete nightmare.

I was reading through some Mazda threads and I noticed that some people were saying that Mazda diesels don't give issues if driven on motorways. From my perspective, I can tell you that this is NOT the case. A disaster of an engine.

Have a loan of a friend's car and I can tell you it is great to be back in a petrol car again. Will have to sort out another car in the new year, but it won't be a Mazda that's for sure.

Glad you got your money back and closure on this this. You can move on now.

gearoidol

TheGreatUnkown wrote: »

Sorry just saw this.

Managed to get my money back thank god. Glad to put this experience behind me, it was a complete nightmare.

I was reading through some Mazda threads and I noticed that some people were saying that Mazda diesels don't give issues if driven on motorways. From my perspective, I can tell you that this is NOT the case. A disaster of an engine.

Have a loan of a friend's car and I can tell you it is great to be back in a petrol car again. Will have to sort out another car in the new year, but it won't be a Mazda that's for sure.

Delighted to read this and everything worked out for you.

FGR

TheGreatUnkown wrote: »

Sorry just saw this.

Managed to get my money back thank god. Glad to put this experience behind me, it was a complete nightmare.

I was reading through some Mazda threads and I noticed that some people were saying that Mazda diesels don't give issues if driven on motorways. From my perspective, I can tell you that this is NOT the case. A disaster of an engine.

Have a loan of a friend's car and I can tell you it is great to be back in a petrol car again. Will have to sort out another car in the new year, but it won't be a Mazda that's for sure.

Thanks a mill for the update TGU - appreciate it as I was really interested in your story.

Any ideas as to what make/model you'd consider?

Something tells me you won't be putting Diesel on the top of the list! Maybe the 2.2 Sky-Activ :pac:

CoBo55

FGR wrote: »

Thanks a mill for the update TGU - appreciate it as I was really interested in your story.

Any ideas as to what make/model you'd consider?

Something tells me you won't be putting Diesel on the top of the list! Maybe the 2.2 Sky-Activ :pac:

There are plenty of decent diesels out there. If he needs a diesel he needs a diesel.

TheGreatUnkown

I'd like to thank everyone for the advice. The solicitor and engineer were key to the success.

Currently working from home, so all my journeys are short. I'm thankful I have a petrol right now as I'd be worried about a dpf on a diesel. Was told by work I will never be doing a 5 day week in the office again, as there will be a lot more working from home.

Can't see myself going diesel again to be honest with you. With the dpf and adblue, think they are getting too complicated now. I appreciate I bought a real stinker, but I'd be worried about reliability.

I'll need another car. Want it to be petrol. Not concerned with power or prestige at this stage. Will be doing a mixture of short journeys and 150 km round trips two or three times a week. I'm a single guy, so don't need a big car either. Would be more than happy in a Fiesta.

TheGreatUnkown

FGR wrote: »

Thanks a mill for the update TGU - appreciate it as I was really interested in your story.

Any ideas as to what make/model you'd consider?

Something tells me you won't be putting Diesel on the top of the list! Maybe the 2.2 Sky-Activ :pac:

No idea on the car to be honest with you. Was looking at Toyotas and their residuals are insane. I was in the Yaris and really couldn't understand how they cost so much. I'm not knocking them, reliability and fuel consumption are excellent, they are just so expensive.

Hahahaha not a chance. Will be giving Mazda a wide berth. I see their 2.2 diesel is getting discontinued. About bloody time. Also, the 1.8 diesel they were offering in the brand new Mazda 3 was discontinued in the UK as well. Seemed to be only on sale for a year. Not sure what happened there.

FGR

CoBo55 wrote: »

There are plenty of decent diesels out there. If he needs a diesel he needs a diesel.

I have a diesel myself which fortunately hasn't given me any bother. I can't help but relate to TGU however as I'd be wary after their experience.

pearcider

I have the 2.2 it’s a superb engine but you do have to do the manual regen every month. Which means bating it down the motorway in 4th gear for at least 20 minutes. Every month. Driving around town will kill the thing.

CoBo55

pearcider wrote: »

I have the 2.2 it’s a superb engine but you do have to do the manual regen every month. Which means bating it down the motorway in 4th gear for at least 20 minutes. Every month. Driving around town will kill the thing.

This has been covered already, the op got a dud, he was doing regular motorway spins.

CoBo55

FGR wrote: »

I have a diesel myself which fortunately hasn't given me any bother. I can't help but relate to TGU however as I'd be wary after their experience.

I have a diesel too. When it needs a regen I bring it for a drive until it's finished. This is all beside the point as the op was doing the correct driving the dealer just didn't want to know, he had sold him a dud simple as that. I'm delighted he got sorted.

chicorytip

CoBo55 wrote: »

I have a diesel too. When it needs a regen I bring it for a drive until it's finished. This is all beside the point as the op was doing the correct driving the dealer just didn't want to know, he had sold him a dud simple as that. I'm delighted he got sorted.

So, this one owner had a bad experience. How common is the problem with the diesel 6? Is this car not worth buying under any circumstances?

CoBo55

chicorytip wrote: »

So, this one owner had a bad experience. How common is the problem with the diesel 6? Is this car not worth buying under any circumstances?

It's very common on the 6, that 2.2 engine in fact. I'd avoid tbh, there are much better cars out there.

Psychedelic Hedgehog

I've had one for almost two years now, and apart from the more frequent service intervals (I get mine done every 12000km), it's been bulletproof.

chicorytip

CoBo55 wrote: »

It's very common on the 6, that 2.2 engine in fact. I'd avoid tbh, there are much better cars out there.

They're such good looking cars - particularly in Red - that I would take a chance.

CoBo55

chicorytip wrote: »

They're such good looking cars - particularly in Red - that I would take a chance.

The red is beautiful especially in sunlight.

Psychedelic Hedgehog

Why, thank you

BBMcQ

Had a 2.2 diesel red estate in platinum and covid killed it. We used it a lot for a 2km crèche trip and then the odd 30km trip to parents in law. It definitely wasn’t the right car/engine for the use but the cheap tax and the love of Mazda made us blind.

Early in the year started to get a gulp in the rev range then reduced power curve beyond 3000rpm. Then we had SCBS lights flashing with the odd check engine light. Mazda quoted me 1200 for a decarbonisation. I went for a Terraclean which stopped the major warning lights. Traded it in for a petrol, best thing we ever did. Went from a car that we owned outright into a PCP deal but happy with the dependability and that it’s the right car for us for 5-10 years!