My ranger has been leaking a clear oily fluid from the front right wheel well, i obviously know this isnt the source, any ideas as to what it could be. Leaks as soon as i turn the truck off.

 

could be brake fluid...that is the only clear fluid on a vehicle

 

how would i find the source?

 

look in the RF wheel area...look for any wet spots

 

Could it be the evaporator drain you are seeing, A/C dries the air in the cab via the evaporator and that water drains out on the right side.

Also the A/C expansion valve or drier can be located on the right side of engine bay.
These are on the cold side of the A/C system so can act like evaporators and cause water to condense on them and drip out.
Also a leak in the A/C system here could cause similar clear oily fluid.