i have 2005 F-150 crew cab 4x4. noticed on the carport it is leaking fluid sumwhere on the front end. not leaking out the differential housing but leaking near the passenger side front axle. any ideas what it could be?

 

Sounds like an air filter fluid leak to me... its probably running down around the engine so its hard to tell where the leak started. Better flush your air filter fluid ASAP!

 

it looks like a gray colored grease

 

possibly pass. side axle seal??