i think its from the turbo, it happens all the time. I'm the first owner of the car. What is your take on this?
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2010 Mazda MAZDASPEED3 Question: i am getting black soot on the back of my car on the trunk from the exhaust
Answer #1patrick mannion from Greg Solow's Engine Room, May 01, 2011, 17:16Master
Black suit out the exhaust has to be a sign of burning oil. Is the engine consuming oil between oil changes? A cylinder leakage test may be worth while to see how much blow bye the engine has past the rings. If the engine or turbo are causing oil to enter the exhaust the life of the catalytic converter will be shortened.
The Mazda Speed3 run on the rich side, if your heavy footed and do a lot of city driving it may be normal. Its more noticable on lighter color vehicles. I would still recommend for your peace of mind having the dealer check the vehicle out just to make sure. The powertrain warranty on your vehicle should be 5yr/60k on engine and turbo.