I know about the B2 piston from:
1) talking to mb techs about a bad tranny in my benz.
2) if you go to:
Scroll down to transmissions and read.
Also Steve also agrees with me, so were pretty sure thats whats wrong with it.
One of the members that posted before the posts got erased mentioned it MIGHT be a bad head gasket, so I didnt know if it would be a good idea to drive this car across the country and have it go out on me in Canada. It would really piss me off to have a broken down car a thousand miles away from home.
The power and fuel milage seems pretty good, I get around 28-30 miles per gallon currently.