EGR cross over pipe discoloration.

[Newsa]

Is discoloration of the EGR cross over pipe (crosses the front top of engine from exhaust side to intake side) a bad sign? I think the old cummins had these pipes made out of a different metal. But my 2013 has a bluish tint to what looks like a bronze or brass alloy of which the pipe is made.

 

[TRAMPLINEMAN]

My '14 is the same as yours. Normal? I have no idea.

 

[mpaulson]

Totally normal.

 

[sag2]

Just the same as "how do you keep chrome headers from turning color? Don't start it.