Can I use a rental car to drive for Uber?

No, unless it's blessed by Uber

No rental cars are allowed per the vehicle requirements"

- must have 4 doors and be able to transport a minimum of 4 passengers
- must be 15 model years old or newer
- title cannot be salvaged, reconstructed, or rebuilt. 
- rental vehicles are not allowed on the Uber platform.
- cannot have any cosmetic damage, missing pieces, commercial branding or taxi paint jobs. 

Source as of 11/2017: https://help.uber.com/h/2ddf30ca-64bd-4143-9ef2-e3bc6b929948

EXCEPTION:

The rental cars are allowed as long as you go through Uber and/or Uber's approved partner.  Check the information here:

https://www.uber.com/drive/vehicle-solutions/

More information from Uber:

Rental vehicles must be part of an approved partnership for drivers in order to be used on the Uber platform. Please note that use of an unapproved rental car can result in permanent deactivation. 

Some cities where Uber operates offer vehicle solutions for driver-partners, including approved rental and leasing options. For a list of approved options available in your city, sign in to partners.uber.com and select Vehicle Solutions or Vehicle Marketplace from your menu. 

(Source: https://help.uber.com/h/d5dd1064-9100-47ee-a37f-404bccea630e)

ippei 1202

Uber Driver, CEO of TaxiFareFinder and Unleashed, LLC