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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 08-22-2007, 07:25 PM   #1 (permalink)
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Engine oil over full

I have 2000 Miles on my 07 Dodge 6.7 truck. My light hasnt come on to change the oil, but I check it weekly and the oil is overfull, it hasnt been like that before, allways on the full mark now its about 1/2 inch above the full mark, I did forget to check it for 2 weeks. Took it in for that and a few other little things and the dealership said it was normal for them to get overfull. Im a Volvo Car Tech so I know alot about engines, just not sure how oil grows in the engine other than something leaking like injectors or coolant. The oil has a slight fuel smell which is normal for the oil to smell something like the fuel the engine is using. Any thoughts, am I the only one with this prob.
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Old 08-22-2007, 07:41 PM   #2 (permalink)
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Sounds like a package of bull cookies to me. The engine oil shouldn't raise unless your getting fuel or coolant in it. Injectors leaking can cause the oil to get fuel in it.

If you take a drop of oil and put it on a paper towel, if a wet ring forms around the drop quickly, you have diesel in your oil.
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Old 08-22-2007, 08:14 PM   #3 (permalink)
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I've heard of this happening in the 6.7's

Mine was over full from factory at the first O/C. Haven't done the 2nd one yet.
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Old 08-22-2007, 08:29 PM   #4 (permalink)
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get it back to the dealer if you have fuel in the oil. i have heard of some injector issues on these 6.7. nothing else other then a coolant leak would cause the level to raise. if there is coolant in there it would be milky in color. Do the paper towel test first ands then head to the dealer

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Old 08-23-2007, 11:04 AM   #5 (permalink)
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During DPF regen extra fuel is injected during the exhaust stoke. This can cause oil dilution, well documented in many OEM tests. Should not cause this level of overfilling unless something is way out of spec though.

I bet $$ on injector problem - do not believe dealer BS. Ask for his response in writing.
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Old 08-23-2007, 01:27 PM   #6 (permalink)
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So have you checked to see if it is getting overfull again. Im debating on taking it to another dealer, or using my free oil change and see if it happens again.
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Old 08-23-2007, 01:37 PM   #7 (permalink)
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I do remember about a month ago I was leaving Wall Mart and I cranked up the truck and it ran like complete and sounded like a big semi Diesel, only would smooth out under boost, no lights or anything oil press was good. I didnt check the oil level till about 2 weeks after it happened. It felt just like my tahoe when the EGR Valve was stuck open. I drove it home, about 20 miles and turned it off and started it back up and ran fine. I did let it Idle about 2.5 Hours that day. Mabey it went into regen mode and didnt turn off and dumped too much fuel in.
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Old 08-23-2007, 01:57 PM   #8 (permalink)
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So does the 5.9 and the 6.7 have the same Injectors, since they pretty much are the same engine with different Emissions Crap. Im also thinking of making a test pipe on the Particulate Filter. Making places to attatch the pressure sensor and the EGT Sensor. There shouldnt be that much pressure infront of the filter if it is new so I dont think it will set a code, the pressure rises when it gets clogged. and the EGT temp should be the same untill it gets clogged up. I have acess to a scan tool to clear the codes it the come up.
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Old 08-23-2007, 09:03 PM   #9 (permalink)
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How would fuel get into the oil from regen cycle? My understanding was that the fuel is injected after the turbo into the exhaust from a seperate nozzle. My oil level looks a bit overfull, but I can't detect any fuel odor yet.... Just ticked past 1500 miles so far.
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Old 08-23-2007, 11:44 PM   #10 (permalink)
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From what I heard it injects fuel into the cylinder on the Exhaust stroke so it is fed into the exhaust unburned to be burned by the cat and the dpf. Im gonna use my free oil change this weekend at the dealer and then monitor it from there. I tried the paper towel idea couldnt see any real diff from it being fuel or oil soaking into the towel.
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Old 09-05-2007, 07:00 PM   #11 (permalink)
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Read that artical on DPF cleaning it tells all, the fuel is injected after the turbo to heat things up.It only does that if the exhaust isn,t hot eniugh to do the cleaning ( out on the hyway) like in delivery vans and constant city drive. Took mine in today because the oil was over full nad a little tick in the engine. He found some soft ware upgrade and blew the computer installing it. Three to five days a caliber loaner,part comesfrom cummins and must be ordered by enginering .
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Old 09-06-2007, 10:14 PM   #12 (permalink)
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Have you had any of the software updates done to the truck they had a major over fueling issue with the factor ECU software.
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