Duramax Second Generation: 2004.5-2005 (LLY)
Yesterday morning fire up the truck, let it warm up for 10 minutes (engine temp +- 100 f) then took off up the drive. I noticed a slight blue exhaust in the mirror. It went away and didn't notice it for the rest of the day. Is there something to be looked into? I had not noticed it prior. EGR...