TECHNICAL

ROLLS-ROYCE AND BENTLEY

https://rroc.org - If you own a Rolls-Royce or Bentley, it is definitely a good idea to join the Rolls-Royce Owners' Club.

http://rrtechnical.info/

GENERAL MOTORS

https://www.cadillacforums.com

https://www.turbobuicks.com

https://gbodyforum.com

https://caddyinfo.ipbhost.com

http://forums.cadillaclasalleclub.org 

http://gmpartswiki.com