quick question....08 550..is it normal for the car to shake a little bit (its minor but i can feel it..) when it comes to a stop...it goes away but it's there almost everytime i stop.

 

No - - shaking is not normal. Do you feel any pulsation in the brakes (pedal) or through the steering wheel? You may have a warped brake disc if the pulsation is there. Is the shake sudden (comes and goes quickly)? or does it start intense and then lessen. Do you feel it in your seat / bottom? ( this is beginning to sound like porn !) That may be suspension related.

Those are my thoughts for the moment - now I'm going to go take a shower

 

Is the shake coming from the wheels/brakes/rotors or from the engine?
I notice that I get a rougher idling engine when I fuel up with 87 octane but at 92 I don't feel any shaking. The shaking I've felt is because of the rough idle.

 

i picked it up yesterday...i think i'll see if it keeps doing in..then i'll take it in..the brake pedal isn't kicking back...i think it's coming from the engine...the dealer filled up the car so have no clue what gas he put in....thing is a rocket tho....the shaking is not that intense but i can still tell...

 

Yes. It is. Start saving for some tires.

 

Yikes i didnt ever think you were aloud to use 87 octane...

 

There is no "law" requiring 'Premium' octane gasoline -- So you are allowed to use regular octane gasoline in cases where the recommended fuel is not available. You can expect reduced performance because the engine control systems will detect knock and other abnormal operating conditions and adjust accordingly.

 

Should be NO shaking.
Sounds like a wheel/tire issue to me.

 

Although I wouldn't say my car shakes I do notice a different feel in the V8's when idling vs a straight six beemer. To me its just V8 rumble having owned American muscle cars. A BMW straight six is sewing machine smooth when idling, the V8's just don't have the same inherent balance in the motor's design.

 

So if the V-8's a rockin ... don't come a-knockin!