Originally Posted by cubalz
Discoloration like that can take some time. I run into that on my Harleys. Get yourself a jar of Blue Job and that should remove most if not all of the bluing.
Well after I posted this I went out side and took my finger and the discoloration wipes right off.
I have been thinking about it and 2000 km ago I did a oil change and I used to always use mobil 1 5w40. But this time i got a great deal on shell rotella 5w40 so I used the shell for the first time. A few days after doing the oil change I noticed a light haze of smoke coming out of the exhaust occasionally at idle and sometimes when taking off from a stop a puff of bluish smoke will come out. I am starting to think that is what caused the discoloration on the bumper.