I just got this email from my sales associates. I hope this helps.
"Ron,
Can you please forward this email to ******* at your Center?
N20 sDrive28i has Electric Power Steering (Servotronic is available as an option)
N20 xDrive28i has Hydraulic Steering System (Servotronic is available as an option)
N55 xDrive35i comes with Servotronic (standard)
Servotronic does not make it electric power steering.
Thanks,
BMW of North America, LLC
Tim Eenigenburg
Area Manager / Area 47
Central Region
498 East Commerce Drive
Schaumburg, IL 60173
Tel: 224-938-3523
Fax: 201-205-1415
Mail:
timothy.eenigenburg@bmwna.com
Web:
bmwusa.com
<img alt="3 Series (F30)" border="0" height="77" width="368">