Gray green substance under oil cap - Cummins ISX15
03-04-2021, (Subject: Gray green substance under oil cap - Cummins ISX15 ) 
Post: #10
RE: Gray green substance under oil cap - Cummins ISX15
Unfortunately this is not moisture. Something else.
Cap just after 1500 miles through NC and TN, sunny days. Excessive blowby (at least I'v never seen it before).
With old oil this substance was dark gray green, now much lighter.


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RE: Gray green substance under oil cap - Cummins ISX15 - SupVit - 03-04-2021



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