Thread: oil level risen
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Old 10-18-2016, 08:28 PM   #18
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City: Gloucester, MA
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Originally Posted by MYTraveler View Post
There is a 4th possibility, at least in some cases. The transmission, which runs at a much higher pressure than crankcase pressures, may be forcing trans oil past the rear main seal and into the crankcase.

So, check your trans oil level -- if it is correspondingly down, you will have a pretty good clue.
I'm pretty sure with the cummins this wouldn't be possible. There is the bell housing between the engine and gear, and any oil pushed out of the engine rear seal, or the trans front seal, would end up in the bell housing cavity and come out the drip holes at the bottom.

I think the first step, as others have mentioned, is to get an oil analysis done. That will tell you what the foreign fluid is, and put you on the right track to locating the leak.
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