oil in air lines

Usually is

 

CK. air under air direr for oil, good chance air comp. needs to be replaced, use new one if $ poss.

 

And get prepared to replace a lot off valves.
Damage has been done.

 

Find your foot valve and see if oil is running out of the EX. port if yes its every where, just listen for leaks and hope it passes thru after you replace air direr cartage.

 

Oil attacks the seals in the valves.
So to answer your question..........all the airvalves on your truck.
That's why it is never a good idea to wait till a compressor breaks.
And i have known a O/O selling his truck because off oil in the system.

Lets hope you get lucky .

 

OK. unscrew the steel braided air line from comp. take a Q/tip an wipe inside too CK. for oil coming out of comp.