First off, Hi all!
This looks like an excellent forum and a very generous community, especially in terms of the wealth of knowledge here. I hope to see some of you around!
In any case I bought my '06 MS6 in September in Houston and drove it back to MI by which time it had about 46k on it, and it's been in the shop 3 times since then for various issues, but since the temperature finally dropped here this week, it's been smoking quite a bit. I've noticed it whenever I am in stop-and-go traffic for any length of time. It seems to dissipate to some extent when the car is warmed up (and I always wait until the temp gauge nudges off of its peg before I move the car). However, any time I actually get on the gas, be it at highway speeds, around town etc...I get a puff of white smoke when the turbo spools up. I haven't had a chance to do the Mazda TSB test yet, but as I'm due for an oil change, I think I'll try the 5w-40 and see how it goes.
Any other suggestions?