Thanks!
WW2 jeeps were from fabric all Olived Drab but many discussions on what beeing the correctk olive drab color. There were probably many differences due to different LOTS, different factories, temperature when applied and so on. I would find one you like among those approved by most people.
After assembly line some where painted navy grey, airforce blue, USMC forrest green etc.
GPW engines were Ford Engine Grey almost same as Ferguson Grey.
MB engines were green, olive drab.
Take a look here for more info about color on the colors on the jeeps:
http://jeepdraw.com/PART_COLOURS.htm
Svenn