What would cause this??

[Nostalgic]

(11-27-2021 )Signature620 Wrote:  Cummins call them 'white bands'. They are harmless and will show up on nearly every ISX overhead.

Brand new valve cam and all new rockers and had white bands showing up on just about all of them in less than 10k. Supposedly caused by oil oxidation according to Cummins. Not sure how my oil oxidized that quickly, but whatever... Might as well just toss a couple scotch pads in next time I do an overhead lol. <<-- Sarcasm, just in case someone took it literally.