Gray green substance under oil cap - Cummins ISX15

[SupVit]

(03-05-2021 )Rawze Wrote:  I would have timed it properly any ways... all the old manuals required you to time the compressor to reduce knocking and prevent imbalance to the engine...

I know it, sir. I watched ALL your videos (except programming). I like to start repair work having info about every bolt and nut. That is why I asked him to check for manual again.
Anyway something worse appeared in the engine causes smoke from the oil tube, horrible knocking (claps), ...
Got load IN-NC. I will try to record knocking sound somewhere in KY climbing a hill.

(03-05-2021 )snailexpress Wrote:  Do you use any fuel or oil additives?

No.

Ps
Bought inline 6. Thanks Waterloo for assistance with making right choice.