Borescope of chrome cylinder walls

[neonbjb]

My -6A has an engine that is getting on in time, about 1900hrs. Since the oil consumption has been getting higher, I thought I'd go ahead and grab a borescope to see what the inside is looking like. I'm a bit perplexed by the appearance of the cylinder walls in all of the cylinders - they have a scaly appearance that I have not encountered in what I have read about borescope analysis. Does anyone know what this is?

These are "chrome" cylinders that replaced the originals about 600 hours ago.

Three of the four cylinders also had a noticeable amount of oil in them (i.e. more than just a thin film). This is about an hour after shutting down from a long flight. Is this normal or anything to be noticeably concerned about?

[rocketbob]

Perfectly normal for chrome cylinders.

[Mike D]

My understanding is this is channel chrome.
They need to crack the chrome to allow the oil to stay on the cylinder walls. Your seeing the cracking or channels.

[neonbjb]

Awesome, looked up channel chrome cylinders and sure enough this is what they look like. Thanks for the help guys.