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Hi everyone. I have a 2002 Mack RD688S with E 7, 350 HP with 621,0047 miles on it. Yesterday when I checked the oil I noticed it appeared to have diesel in the oil. The truck doesn't miss or smoke. So what could be causing this?

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Sounds like EUP seals/orings. 

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Thank you. Looks like it's time to get oily and greasy. Thanks again

 

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Yup oilly! also fairly common as strange as it may seem  is injector orings fuel can leak up by the injector hold down threads  ! and the fuel transfer pump  shaft seal can leak another semi common issue!

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