My vin is higher than than the 01-046/06 TSB covers, my production date is 12/06. I have very bad soot (I've owned turbo eclipses for the past 8 years, and I work on SRT4's, turbo hondas, WRX's, etc.. on a regular basis, so I know how much soot is normal). I also have a cloud of smoke develop when the car sits at idle for a few minutes after I drive it. Smells like sulfur. It doesn't do it every time, but at least twice or 3 times a day. It's embarrasing for a new car to do this, especially with only 8,000 miles on it. It happened when the car was idling for a minute at the mcdonalds drive thru today, huge cloud of smoke, at least twice the size of the car. Stopped smoking as soon as I started driving. Anyway, I found a TSB that covers it. TSB number on the sulfur issue is 01-043/06. Covers all Mazda3 vehicles (actually, just about all other Mazda vehicles too). It states that you should change the gas station you are going to because the sulfur content of the fuel is too high and the cat oxidizes (sp?) it which creates the smell. LOL. What a fix.
That being said, I'm going to try Valero gas instead of the Hess that I was running (in all my cars, and sportbikes, for the past 9 years). I was using Hess cause it's the only place in the area that sells 93 octane. Everywhere else only has 91. I wish there was a Shell station in the area, because I have heard their gas burns the cleanest and has low sulfur levels (they are considered a top-tier fuel).
At least we dont have CX7's. Mazda's fix for a CX7 with alot of soot (so bad it makes the bumper black) is to just put a longer tailpipe on so that the exhaust fumes are farther from the bumper. (TSB number 01-028/07).
Also, the guys that said they had a reflash done and it made the car feel smoother and it ran better, but had less "punch"... check out this TSB about a certain CX7 ECU reflash. Keep in mind the CX7 has the same engine as a MS3.
While I was reading all these TSB's I also found out why my car has little grey dots inside the hood jamb... I guess it was delivered to the port in NJ while the Navy was painting some ships grey, and they got overspray on a bunch of Mazdas that were being unloaded. Mazda's fix was to have the dealers clay-bar the cars with the overspray to remove it. Wonderful...