Yep my oil was replaced at 2000 klms. My dealer actually told me the info has been passed to Japan for comment and hopefully a fix.

Mine was replaced at 2500 km

Mine was replaced @ 5800km

Mine @8300kms and Im told Mazda JP are working on a fix.

Mine was replaced at 750Km!!!!

Im at 9500kms and my car and my oil are perfect. LOVE LOVE LOVE my CX5!!!

mine at 1700kms and on the rise again

Mine at 2000 and again at 5000. Have had burning smells that are quite scarey. Apart from that great car. Pease mr Mazda get a fix for it

I have to take it back every 1500kms for an oil change. Thats about 3 weeks of driving for me. Unsustainable situation. Would not recommend this car to anybody. I will be lodging a complaint with consumer affairs. Mazda will not act until sales drop or they get into a legal mess. Ahh, now they are under filling the oil so that the X mark takes a bit longer to reach. What a joke.

Hi are u all from east coast and do short stop start trips ??as keen to buy diesel and reports say they are from short trips

Just cancelled my order for a diesel cx5. Dealer told me the problem was they were putting the wrong oil in and they have since changed the type of oil which has now fixed the problem. Interesting comment given I had bumped into a guy just the night before who told me he worked for a Sydney dealer who had given him a cx5 to drive back and fore to Wollongong each day (mostly freeway driving)... His comment was great car but his oil level was rising again and he was currently having his oil changed every 5 kms! Mazda need to come clean over the matter and take a bit of responsibility for what is obviously a design issue.... It is irresponsible of them to continue to sell these cars while the problem remains unresolved!

Is this a problem specific to Diesel models?

Yes, the problem is just related to the diesel models.

Replaced here @ 6000km

Mines been in 4 times already and has only done 6500km

Yeah so far I am on change #3 and done 13,000 Kms. Its getting annoying. Mazda head office said they are aware of the issue and working on a fix. My local dealer tried to tell me it was normal. But mazda Head office was at least honest about it.

Just booked a service tomorrow due to the oil issue @ 3000km. Burning smell. Used the diesel only from Shell stations in Melbourne.

It has been just a week and the burning smell is back again. Guess another service is a must. Last time some oil got drained and software update applied. Nothing promised though as Mazda is still working on it.

Went for a test drive in the Maxx Sport - nice drive, but got the burning smell on the way back to the sales yard. The GT I tried didn't have the smell, but the ride was much rougher. Can't consider buying either unless the oil problem is corrected.

Don't worry about the burning smell, that is the car doing a regen. That is all do with the DPF & the cleaning process.

My car has done 8000kms and had three oil changes. A Mazda engineer was there for the second oil change at 4000kms. Pretty lousy for a four month old car with no fix on the horizon. I believe the car was delivered with a known potential fault (copius stuff on Internet predating my ordering of the car) and is not fit for purpose. Research has shown that possibly up to 10% of diesel CX5s have been affected. I have lodged a formal complaint to the ACCC.

To reduce pollution the diesel particulate filter (DPF) behind the engine catches exhaust particules then burns them off through active and passive regenerations.

Active injects extra diesel into the engine and gets the DPF hotter to burn off those particules. Passive is when the DPF gets hotter through about 2000 rev highway travelling.

It is multiple active regens that I believe has caused my oils gains. After one active regen I took my car for a 2500 rev highway trip of 250 kms. As I was nearly home it went into active regen again. There was no passive regen otherwise the active wouldn't have occurred.

Why does it occur? It could be poor diesel fuel, vehicles not getting hot enough for passive regens, ECU issues, DPF issues (backpressure) or heaven knows.

The CEO of Mazda wrote on 6/9/2012 that 'customers are the most important part of the business'. I am yet to experience those sentiments!

Because of this Mazda wil not see me and the costumer sales was absolutely poor...Grandprix Mazda Aspley

Yes i wont buy my wife a new cx5

This issue has been resolved by Mazda and is being implemented free of charge to all vehicles. Further to this, all oil changes have been completely complimentary for all customers.

As long as engine longevity is not compromised. Even so it took 6 months to reflash the PCM. I am driving 2800ks in the next few days so we will see. Also I believe another PCM reflash is due in circa 6 months - re the numbers of regens as opposed to the current one re amount of diesel added for the regens.

I have just decided not to buy a CX5 given these comments

The fix from Japan is: update to software, new dipstick with altered full mark. So far my diesel oil issues have gone completely. Fuel economy is superb.

We also have had the fix applied to our car. No issue so far & fuel economy is great, sits around 6.3 (city driving).

it is not only a diesel engine issue.I own a cx7 turbo non diesel,and i recently experienced the same issue.oil level way to high .and again it's a gas engine.

My Hyundai ix35 diesel has never done this - maybe Korean cars aren't bad after all! - handles like a wet sponge though...

Interesting comments cx5 no longer on my buy list !!

Took a "new" 2.5 AWD petrol & a diesel Maxx Sports for a drive last weekend, the diesel is still the pick of the bunch power wise, however the 2.5 is very smooth & quite on the road, but still holding off until some more positive comments start filtering through.

goodness - I was about to press green on an order of a CX5 - not now - thank you one and all - sorry you had to go through that but thanks for sharing this information!

Thes problems with Mazda diesels are not new. If you want the full horror stories, Google "Mazda 6 dpf problems". The rising oil levels are caused by the injection of diesel fuel into the exhaust system, where it is supposed to raise the exhaust temperature sufficiently to "regenerate" (burn out) the diesel particulate filter (DPF). Much of this injected fuel finds its way into the engine oil, which raises the crankcase oil level. In our 2007 model a blocked DPF usually puts the vehicle into "limp-home mode", but could also cause the vehicle to run out of control if the oil level got high enough for the diesel "wallow" from the crankcase to begin feeding back into the engine's air intake via the exhaust gas recirculation (EGR) system. The diesel particulate filter will ultimately self-destruct as well, causing the same dramatic loss of power that VW owners are now reporting and which caused the death of a VW driver in Melbourne when her car lost power and she was rammed from behind by a truck. In our case, we were two-thirds past a B-Double on a two-lane highway when I realised we no longer had the acceleration to pull clear before a head-on with an oncoming vehicle. Everyone in our car was screaming with fear. Thank God, the other driver swerved off the road, and our lives were spared. Mazda wanted close to $9000 to replace the DPF to get our vehicle out of "limp" (the DPF failed just after the warranty expired, but Mazda doesn't guarantee filters in any case. Nobody in their right mind would buy one of these vehicles if they had been warned about these these potentially deadly flaws.

Im starting to have oil rise problems at 650km so from this point i look like a oil change at about 2000lms. If this is the case then this car cannot do what Mazda claims and as they are fully aware of the situation the only way will be too put the case to the courts.Shame as the rest is good.

Anyone who believes that Mazda has a fix for the diesel problems is a fool. They go through the same [censored word removed] with every new diesel model. If you want a car that will be worthless within three years, buy a Mazda diesel.

My new Mazda6 has the oild rise issue, halfway to new X mark on the dipstick after only 4000km. I will be asking them to justify the engine is fit for purpose. It does and active regeneration every 260kms, I will be asking them to reschedule this to 500km and see if the oil contamination is reduced.

Get your act together Mazda.

I got sick of taking ours for oil change every 2-3000kms, they changed the dipstick for one with a higher oil level line (wow thanks) I don't check the oil anymore if it blows up they can fix it. We will be selling it before warranty runs out otherwise a great car but won't buy another Mazda again, unhappy Mazda customer .

has this problem been fixed?

Love the car and the CX5 Diesel was #1 on my shopping list for my next lease before I read these comments ... sorry Mazda but not taking the risk, your loss .... just glad the Honda CRV CDTi hs just been released and at the same price range.

I brought our CX5 in 10/12 and have done 50000km and not had an issue with the car being serviced ever 10000km. I had heard about these increasing oil volume issues before we brought the car and when I researched the problem found that almost all turbo diesel cars and SUV's can have the same issue and it has been report in BMW's. Mercedes, Volkswagen's, Toyota's, etc. The design of the modern turbo diesel cars to meet emission standards means that the engine breather is now feed back into the turbo whereas in the past it when straight to the atmosphere.

wow... talk about an over reaction i have had my cx5 diesel maxx sport for 3 mths now and it has not missed a beat. i think this all comes down to the responsiblity of the owner and actually having an understanding of how a diesel engine works and more importantly how it needs to be operated. A prime example of tall poppy syndrome indeed

Our Mazda diesel didn't miss a beat for 18 months. Very different story after that, and worthless after three years.

Thats interesting dave in what way is it worthless, resale?

After three years it needed $11,000 worth of work done on it (Mazda quotes), following failure of the diesel particulate filter and the air-conditioning system, recurring shudder from the front brakes and the now well-documented problem of crankcase oil dilution by diesel fuel. Before four years were up, there were similarly expensive injector and turbo boost problems. One of the reasons we paid extra for a diesel vehicle was that we expected a good resale value, but the problems with these vehicles are now so evident that no informed buyer will touch them second-hand. Read the British Automobile Association advice here:

[link removed]

How much would you pay for a three-year-old vehicle that needed $11,000 spent on it to make it roadworthy, with the knowledge that the problems were inherent in the vehicle's design. These vehicles are extremely seductive when new. It can be a very different story a little way down the track.

The British Automobile Association advice (see above) states that the average life of a diesel particulate filter is a bit more than 100,000km. Ours failed (blew apart) at 112,000km, which tallies pretty week with that advice. So at Mazda Australia's scandalous replacement cost of almost $9000 (much cheaper overseas), you need to allow $3000 a year, or about $60 a week, continuously just for DPF replacement. I would sternly advise Mazda diesel owners to get rid of their vehicles before the DPF packs in, but that, of course, is just passing the problem on to the suckers who buy them second-hand. Plenty of anecdotal accounts on Mazda forums from aggrieved buyers of such vehicles.

Mazda dealers prices are a joke in this Australaia. I was quoted $900 excluding labour for replacement of a Denso fuel suction control valve. I bought the valve retail from Denso at Wagga Wagga for $164 and it took me 10 minutes to fit it myself -- easily accessible and only two Allen screws to undo. God knows what a Mazda franchise would have charged!

Does Mazda solve oil issue? I read all thread but I don't understand. Are there any ower 2014 brand that found the issue?

I have a mazda6 diesel for 2 years and have driven 42000kms. Only have changed the oil at 10000km intervals. The oil level on the dip stick only gets to the 1/2 way point between F and X. I believe the diesel in the mazda6 is the same as the cx5.

LOVE MY CAR

Phil -- So the oil lubricating your engine and turbocharger is only being diluted about 20 per cent with diesel fuel! Good luck with that.

I have had my Mazda 3 MZR-CD for just over 4 years and travelled 120,000 km. Never had a problem with the motor and is still going strong. This is the best car I have ver owned and I will be replacing my Nissan Pulsar with the new BM Mazda 3 XD Astina (the new mazda 3 Diesel) in 2015.

I'd advise potential buyers of Mazda diesels to ignore John's plug for the new Mazda 3 diesel and read all the blogs for problems with diesel particulate filters (DPF). If John's experience with a Mazda diesel is genuine, he is either Robinson Crusoe or really pushing his luck. The British Automobile Association estimates the life of a DPF at around 100,000km. Replacement cost for a Mazda DPF is close to $9000, so I hope John has been putting aside the extra $43 per week he will need to replace the DPF if he keeps his old Mazda 3. But surprise, surprise! He apparently intends to keep the old Mazda 3 and buy the new model as well (it will replace his other car -- the Nissan Pulsar). This blog is, I suspect, straight from Mazda Central Casting.

Dave, you are full of yourself. I have nothing to do with Mazda, but love my Mazda 3 Diesel and yes I will be buying another one.

Good luck to you, John, if you have not had problems with your Mazda diesel. We didn't either, when we were driving 30,000 km a year. As soon as we started using the vehicle as a town car, things rapidly went wrong. My advice to you is to get rid of your original Mazda 3 diesel before the DPF needs replacement, unless you are happy to pay out $9000 for the privilege. If you think that will not happen, you are sadly mistaken. Read the blogs, read what the British automobile Association and many other experts have to say on the subject. Our Mazda 6 diesel, carefully maintained, was virtually a write-off in a little over three years and 114,000km.

I own a mazda 6 diesel and had dpf issues after about 50000km. Faced with the choice of a $9000 replacement bill or removing the dpf and reprograing the ecu for $2500, I chose the latter. Two years later the car is still going strong, and get about 100km further per tank. Yes is does blow some smoke like most diesels do, otherwise a great car. I sure hope they have fixed the problem on the latest model....it's a great looking car ild love to update too soon!

All these comments about the DPF are quite worrying. We have a 2007 Mazda 6 Diesel, we've now done just over 154k kms in it. Had minor issues (left front wheel bearing needed replacing, cv join seems on its way out now), but nothing major. However we are semi rural so very few lights where we travel and we do about 25,000kms a year - it sounds like that is the critical factor, little stop start. We've plans to keep the car until next year.. hope the DPF lasts that long.

BB55, you are taking a bit of a risk. I believe the fine for removing the DPF is something like $25,000.

Benjsc, you shouldn't have a problem. Most DPF problems are caused by drivers not understanding the regeneration process. I you allow the car to continually complete the regeneration, the DPF should remain problem free.

I assume that should be 154,000 kms, benjsc. We still have our 2007 Mazda 6 diesel, because we cannot afford to replace it. When we bought the car, Mazda said the dpf was maintenance-free. Until it final clogs up that is -- then you are up for $9000 to replace it. It's interesting that Mazda has never been game to market its diesl passenger vehicles in the United States, where consumers are more litigious than we suckers in Australia and the UK. We are the guinea pigs here, and you will notice on US blogs that complaints about Mazda diesel faults in Australia are being taken seriously in the United States. Our experience was that the stop-start was the critical factor in shortening dpf life (we also had failures of air conditioning (twice) and continuing shudder from the front brakes. To keep the vehicle going, I gutted the dpf filter and fitted emulators from the UK (about $A700) rather than pay $9000 to Mazda Australia to replace the dpf. So we now have a "dirty" diesel, which for a while performed like the original but with better fuel economy. We are now getting error messages about low turbo boost, which appears to be a new and expensive fault. The car lacks power when under load, but we have always been reluctant to spend anything on it since the dpf failed at 114,000 km, so we put up with the reduced acceleration and loss of power on hills. This problem is not not connected with the emulators, which merely tell the car's computer that the dpf pressures and temperatures are normal. I would recommend that when you dpf packs it in (as it certainly must) that you consider emulators -- rather than the more expensive edu programming mentioned above by BB55 -- as an alliterative to replacing Mazda's "self-maintaining" dpf. If your engine oil levels have not been rising because of contamination by diesel fuel injected in failed attempts to regenerate "burn out" your dpf, then you are fortunate. Contamination of the engine lubricating oil with diesel fuel, which is a common and apparently continuing fault of the Mazda system -- can only shorten the life of your engine. I can supply the source of my emulator supplier should you ever need to take that course of action.

Mazda's line, like John's, has always been to blame the driver because he/she "doesn't understand the regeneration process". It's b/s, of course. The dpf is ultimately clogged by ash, not soot. The ash, unlike the soot, cannot be removed by "regeneration", although (of course) Mazda doesn't tell you that when you buy the vehicle. Perhaps John would like to tell us the source of his information about a $25,000 fine for removing the dpf. I understand that NSW law generally states that the exhaust system may not be modified without "just cause". Of course, it's impossible to tell that the clogged filter material has been removed if the dpf casing is still in place. Mazda has given evidence in consumer actions that its Denso ecu (computer) cannot be reprogrammed to ignore the dpf. That is also b/s. The truth is, as admitted freely by some other manufacturers, is that the dpf is a consumable item -- that it has a limited life (averaging about 100,00km, according to the British Automobile Association.) That is in line with our experience, and that of many other owners of diesel passenger vehicles fitted with particulate filters to meet European emission standards. With Mazda diesels, someone, sooner or later, is going to have to shell out a ridiculous $9000 for a new filter, or look for alternatives.

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I have just done 60,000kms on my top of the range CX5 Diesel and they are about to replace the engine and Turbo system! I understand that the cam shaft (or something) deteriorates and sends metal fragments through the system. So after 4 or 5 oil warning lights, 2 engine lights and a final system failure, the car is back in the Mazda Dealer's repair shop. Fair to say that this will be the last Mazda I own!

My 2012 CX5 diesel has just gone in to dealer to have the engine replaced under warranty. It was damaged from overly diluted engine oil. The dealer had 2 other CX5's getting the engines replaced before mine.