Diesel Bombers - Oil in Coolant Reservoir

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ckbones

01-29-2024 01:37 PM

Oil in Coolant Reservoir

Hello. ON y 02-7.3 there appears to be oil in the coolant reservoir. Are there any tests that I can do to see where the oil is coming from and if its motor oil or diesel?
Thanks and see picture.
Appreciate the help.
https://cimg7.ibsrv.net/gimg/www.die...e74e0860fd.jpg

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