Nothing.
The only thing I put on the car, is oil, each 8000 km, and winter tires.
I own the car since end of June, I mostly drive the car on the highway.
This car hands the road very well, it is a sportive driving. I would like better to get the V6 3.0L in there, but the 4L is pretty cheap running: around 8.0L / 100km, and this is higher than the speed limit!!
Good car, reliable, comfortable... at this price, you can get a camry, or accord, but you won't get the same driving feeling than the 6!
Now have 37 000 km and still no problem.
Hey buddy, if you get this message send another update as I am looking at the mazda 6 (2007 or 2008 models)...used of course with low mileage and I would like to know of problems problems problems.
Right now, 53 000 km.
Only thing I did was the rear brake pads.
The front one are still 63% good.
And then add some grease into the steering foot (under warranty), they told me couple of 6's like that miss some, and won't need it later.
I'm still driving a reliable, fun car.
I recommend it for everybody, especially the sport version (like the sedan style, but with the hatchback and a wiper on the backglass)
The fuel consumption is around 8.2 liter / 100km...
If you're still out there, about to buy an 07. Can't wait after my tester. Only 77k on it.
I just passed 70 000km this week, nothing went bad since the rear brake...
Still getting around 8,0 L/100 km.
So far, I highly recommend this car to anybody...