2006 BMW 550i Questions

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master cylinder and booster were replaced and brakes bled, car drives about 3-4 miles and then the brakes start to slowly apply until they lock up, turn car off for 2 minutes and brakes reset/let go and car can drive for 3-4 miles until same problem occurs.
I bought a 2006 bmw 550i and its saying (tranny malfunction) and its in safe mode. for me to put the car in drive I have to use the shift lock method and when I do that the car jerks forward if in drive and jerks back if its put in reverse. will that be the reason why ? or is it just the tranny is going ?
We fix a small pin hole in water resevoir tank. The person broke the stem of inside resevoir. Will that make the info. light stay on. All we did was fix hole and filled it back up with water. Please help!
Smoke from exhaust pipe can be quite large, have to step away from vehicle. It happens at random times, not just at start up, but even after been driving for hours or while sitting at stop signs. I've spent hundreds $$. Can't seem to find problem. Where to take in Santa Barbara area? Thanks for suggestions.
from time to time when driving up a hill, right after starting the car, it will make a noise that is a rough sound. it has always stopped but now I learn I have a minor oil leak. can this be serious?
Car bought new in dec 2006....2006 automatic bmw 550i.
From the beginning the car made a grinding noise when driven from a cold start when speed was 35 to 40 km per hour. The transmission settles into fourth gear at this speed. The grinding noise disappears after 20 minutes of driving. The sound is much worse when driving up an incline at the same speed...namely 35 to 40 km per hour. If I switch to manual mode of transmission the car cannot be shifted manually into fourth gear at the above speed. The transmission merely reverts to third gear.
This problem has stayed stable since I bought the worsening nor improving.
I was told by employees at the dealer(who were not supposed to divulge any information)that recalls were issued for this problem and that only some of the 550i's built between Jan and Mar 2006 had this transmission problem....the first 550i's were built in the above three month period which is when the 550i's were first introduced for sale to the general public. Allegedly the cars on the recall list were fitted with new transmissions.
Is there any way that I can find out if my car's serial number was on this list? My dealer refuses to acknowledge that there is a problem, merely replying that this noise is normal for 550i's built in this three month period!
I am awfully frustrated.

Irwin Rodier
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