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I have nearly 140,000km on my 09 M6 2.2 Wagon (GH series) and no issues yet. I had every service done at Mazda during the warranty period, including the bigger 120,000km service which included pulling the injectors and inspecting.
I do some pretty long runs regularly, which helps with the automated DPF regen cycles I believe.
I decided that once out of warranty, I would do the simpler service intervals myself and save the dough for the bigger services. To that end, I did the last oil change myself with Penrite Enviro+ DL1 5W-30. I think it was only $52 from Auto One, meeting low ash specs for the car. Filter was a Ryco Z79A ($10) and a $2 sump plug washer (14mm). I also used my torque wrench on the plug as I have a nasty habit of being a tad heavy handed.
I did an oil data reset when I did the service, found the info on how to on this forum somewhere.
Personally, I think Australia might be a better suited place for these cars. However, when we bought the car the salesman did ask us what kind of driving we did as an upfront question.
Even if you only do short runs, you should only need to keep an eye on that oil level every once in a while and only do a forced DPF regen only if absolutely necessary. Instructions for that were on the same page I found.
That 120,000 service I got done (which is the 75,000mile service that gets mentioned a bit around here) I think is important, even though Mazda said a lot of folk didn't bother getting the injectors checked because of the labour cost. Pretty foolish I think. We are owners of vehicles that have some pretty tight operating tolerances even in regard to the common rail injection alone. So getting injectors checked and calibrated is a pretty important step in the whole ownership saga. If they start fouling up or weeping you will have much more soot getting picked up in the DPF. Sure you can run the car without a DPF, but if the injectors and other control systems are not kept in regular tune, then it will run like crap anyway, just without the flashing lights.
Last edited by Norm_AU; 02-13-2014 at 10:21 PM.
Reason: Updated oil brand info