Hi Guys,

I'm looking to buy F10 2010 520d and it has 7 gear automatic gearbox with paddle shift.
My question is - some of them have 7 speed automatic gearboxes with paddle shift on the steering wheel, and some of them 8 speed gearbox.
What is the difference between 7 and 8 gears gearboxes and which one is better?
I found that M5 has 7 gear automatic gearbox but I couldn't find any info regarding 520d with 7 gears.

Thank you for answers.