idle rpm and DCT

[maicol76]

Hi, guys
My M was repaired, and new engine is under hood.

I notice that after the car is completely warmed up and DCT is in D1,
idle rpm is steadily at about 770~780rpm.
If I remove DCT to neutral, rpm is down to about 650 and stay there.

And when DCT is in D1, I put brake pedal, idle rpm is down to about 650 and stay there, too.

Sometimes, always 650 in all condition.

Is this normal?, just curious.