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Old 03-19-2009, 08:01 PM
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Fuel in engine oil

Hey everyone,
I'm hoping you can help me out here. I've read A LOT of posts here and I cannot believe the talent! I found one post similar to this but no responses so I decided to start my own thread. I have a 2004 F250 with about 84k miles; Seems there is a fuel leak as I am getting contaminated engine oil. My question is; what is the best way to pinpoint the leak? Are there common leak areas such as injector o-rings? Is that the only internal place fuel can leak from? Do the fuel lines seal to the heads in an internal or external location? I've never tore into a diesel motor before but have moderate experience w/ head gaskets, valve work etc on gassers. Is this something that could be done in one weekend?
Here's a picture of my rig:

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Old 03-19-2009, 08:06 PM
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ya its prob a injector oring. any codes?
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Old 03-19-2009, 08:07 PM
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I would say it almost has to be injector o-rings or injector cups. I dont know that much about 6.0s but CAT engines uses a very similar injector in C7 and C9's and most of the time when we see fuel in the oil i comes from alot of idle time(rare) or for injector o-rings an/or cups. The injectors arent too bad but 6.0 are kinda hard to work on without taking off the cab. That being said the cups are a little different story because they require a special tool to remove them and install them. YOu might be able to find one but i dont know where for sure. Hope that helps.
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Old 03-19-2009, 08:08 PM
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is an 04 still under warranty?
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Old 03-19-2009, 08:15 PM
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THANKS for the quick replies - It's definitely not under warranty. No codes either - I found out there was a problem from used oil analysis. I've got about 15k miles on the oil and it's got 5.7% contamination - I should have realized the problem at 3k when it had 1% contamination but I thought that was from idling and it didn't seem too high...
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Old 03-19-2009, 08:17 PM
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wasnt sure i thought it was 5 year 100k mile warranty. I dont know what that percent means mainly because you run your oil alot farther than i ever did. Who does your oil annalysis?
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Old 03-19-2009, 08:21 PM
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Quote:
Originally Posted by dzchey21 View Post
wasnt sure i thought it was 5 year 100k mile warranty. I dont know what that percent means mainly because you run your oil alot farther than i ever did. Who does your oil annalysis?
Oil Analyzers Inc has done that last couple - thought about changing to Empire because they are local and less expensive but I don't know.
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Old 03-19-2009, 08:29 PM
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ok. Ill call the oil lab tomorrow and see what they say the field trucks fuel dilution is for a 6.0 if i remember lol. Thats alot of miles so ill see what they say for something like a 5k oil change.
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Old 03-19-2009, 08:30 PM
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did they say that was bad? If you drive around town every day and dont change your oil every 3000 i dont think 5.7 would be that serious of contamination. do you let it idle a lot?
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Old 03-19-2009, 08:33 PM
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Quote:
Originally Posted by dzchey21 View Post
ok. Ill call the oil lab tomorrow and see what they say the field trucks fuel dilution is for a 6.0 if i remember lol. Thats alot of miles so ill see what they say for something like a 5k oil change.
Thanks dzchey21! I'm trying to use extended drain intervals w/ AMSOIL but it may not be working as well as I'd hoped.
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