I have a brand new Mahle P/C set.
During the preassembly of the engine for checking valve to piston clearense I discovered some bad marks at the barrels.
After some investigation we found out the middle ring made those black stripes.
The edge of the ring have some roughness who you can feel with the fingers.
Have been in touch with Mahle and they don't of this problem.
The have never heard of those problems before.
All the six rings are the same.
The ring gap is 0,35mm.
Has anyone had such problems?
