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Cylinder Scoring

716 Views 3 Replies 3 Participants Last post by  specialp
Just wondering if you think the attached pictures are normal wear for 70,000 miles, or if it is an issue. This is only on one of the cylinders, and it doesn't seem to burn any oil.

edit: Upon further research it appears to be just Nikasil streaking which is normal, still curious on opinions though.


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Welcome to the forum. What you posted is nowhere near enough info to work with. First question: is this supposed to be a cylinder of a CTSV? What year? What engine? The various CTS-V engines don't have Nikasil.... perhaps you have an XLR or another Northstar derived engine?
You're going to need to provide some background or context.
@MrSurly Sorry, I forgot to add more background. It is a 2016 CTS-V with the LT4 with around 70,000 miles on it. The wear is only on one cylinder, just viewed with two different borescopes. It is cylinder 5. Wasn't sure if it had a coating, the color on the first camera made it seem like it might, though it may just be the camera.
I wouldn't worry about it too much unless you are burning a good amount of oil or have a large loss of compression. It is hard to gauge how deep those marks are.

I would just run it and be happy.
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