me and a buddy replaced an injector in my truck the other day and while we were doing this i noticed something. right under the head on the block you could tell something was on it. i rubbed my finger over it and it wasnt wet and it wasent a big spot. prolly the size of a softball. but you could tell some type of liquid had gotten on it. my first thought is headgaskets seeping bc i have not lost any coolant and i have not lost any oil. do yall think the gaskets could be seeping?

What side is it on? Is the upper radiator hose hard as a rock in the morning after it's sat all night?

the EGR cooler could be leaking if its on the passanger side of the engine. if its on the drivers sides if the engine is could be the turbo cooling line

its on the passengers side. i will check out yalls ideas thanks alot. i was also thinking that it could be the rubber hose that runs off the thermostat metal tube that runs from the thermostat to the water pump.