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Hi there
Just joined forum to canvase others view's on the apparant problem with the Diesel Particulate Filter on the Mazda 6 diesel.

I have a 07 plate car.
7000 miles after first service which incidently cost a fortune! the engine oil rose up to the X mark on dip stick so as advised by manual took it to dealer who charged another £110 to change to oil and filter and clear the DPF.

I queried why this was happening and was told I was driving the car too slowly and the car was trying to clear the filter by injecting more diesel (on the exhuaust stroke) into the engine to raise the exhaust temp. Some of this diesel gets past the pistons down into the sump hence the oil level rising!!!!!!!!!

At the same time they updated the ECM and fitted a modified dip stick. The new dip stick has a lower normal full mark (Was told 1 litre less oil was now in sump) giving more room for diesel in the oil before it reaches the X mark and so should last the 12500 miles between services before the level rises above the X. ECM upgrade caused the car to judder/stutter under certain driving conditions so had to go back to dealer for more modifications that seem to have cured this

I wrote to Mazda asking various questions including how I should drive the car to keep the DPF clear. They replied and quoted a driving proceedure that they say is in the Hand Book but its different from whats in mine so they have obviously had to change things. Have written back pointing this out to them and also that I do infact exceed their driving recommendation every week with a motorway commute.

What are other peoples experience of this problem? My last 2 cars were deisels with DPF filters and had no problems with them. Also last car a 320d BMW was giving over 45mpg where as the Mazda struggles to get more than 40 on exactly the same commutes (BMW cost me £90 in servicing in 25,000miles of driving with the mazda already costing nearly £500 in 9000miles)

Very disappointed in car because of above as it is otherwise a good car. Yes I bought it cheap but Mazda did have a good reputation. My wife has a 9 year old Premacy that has generally been trouble free.
 

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Yup, the old story from Mazda. We have the some problems in Slovenia too. Our authorized dealers are telling the same story to us. How we don't know how to drive this car, etc...And than you said, ok this car is useless for town driving, right? And they said no no no...hehe, whatever.

One solution is this. In slovenia we call it a Boss test. The name is after one forum user, which idea this was.

The board computer must be set to show current consumption. So, when you will see that current consumption is rising for instance...If you drive on typical road back home and you know that the consumption around 60 miles is 5.5l, and then sudenly you see the consumption is for instance 8l. Then you will know that DPF regeneration is in progress. Try to drive for a while to make sure the regenerations process is over.

Why doing it? You won't be interrupting the DPF process, that means you won't add any extra gasoline to your oil. Of course you can't always do this, but sometimes is not so hard.

Do you have the latest ECU upgrade about the DPF problems?
 

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DPF issues

WOW!! I can't believe what I am reading, is this for real? How do Mazda justify this course of action. The fundemental issue here is that fuel is passing the piston rings into the engine therefore diluting the engine oil. How long will it take for my high mileage use to wreck the engine and other components? I have just clicked on the Longlife link above and had a very interesting chat about DPF removal. Seems to me that if I get rid of the root cause of this, the DPF, I am more likely to enjoy the other aspects of this car that attracted me. Booked in at Birmingham next week, I will keep you posted.
 

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WOW!! I can't believe what I am reading, is this for real? How do Mazda justify this course of action. The fundemental issue here is that fuel is passing the piston rings into the engine therefore diluting the engine oil. How long will it take for my high mileage use to wreck the engine and other components? I have just clicked on the Longlife link above and had a very interesting chat about DPF removal. Seems to me that if I get rid of the root cause of this, the DPF, I am more likely to enjoy the other aspects of this car that attracted me. Booked in at Birmingham next week, I will keep you posted.
My daughter's got the same problem. I'd be interested in who you use in Birmingham and how good they are.
 

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Hi anyone.
Would an extremely over full sump (well above the X) make the engine rev very high of the scale?
Mine did this last week. Have since changed the oil but am too scared to start it up again.
Many thanks
 

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  • what sort of oil are you using?
  • do you drive a minimum of 30 minutes per trip?
  • do you drive in stop and go city or backroads/highways with little stopping.
-any check engine light?
- do you idle the engine excessively or make short distance trips while the engine is still cold?
-does the problem become worse in cold weather?

- first solution, is to simply change the oil more often.
 
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