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Gray green substance under oil cap - Cummins ISX15
02-23-2021, (Subject: Gray green substance under oil cap - Cummins ISX15 ) 
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RE: Gray green substance under oil cap - Cummins ISX15
Like I stated, looks like moisture build up to me, unless you are seeing something that tells you different. You can do an oil test to see if any coolant is in the oil, but odds are, if the truck is not driven regularly, it is moisture build up. This is common in winter.

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RE: Gray green substance under oil cap - Cummins ISX15 - Waterloo - 02-23-2021



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