Fuel in Oil - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax 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 Ect

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Old 02-13-2012, 10:40 AM   eBay Motors  #1 (permalink)
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Fuel in Oil

02 Duramax LB7
Just changed my oil and it had about 5 gallons in it, compared to the full amount of 2.5 gallons. Very thin and smells like diesel.
My first guess was the injectors but they are fairly new 50hp industrials. Any other ideas of what it could be??
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Old 02-13-2012, 10:46 AM   eBay Motors  #2 (permalink)
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line leaking?
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Old 02-13-2012, 10:50 AM   eBay Motors  #3 (permalink)
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Haven't tore the vaulve covers off yet. Going to start with the passenger side and see what it looks like.
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Old 02-13-2012, 10:55 AM   eBay Motors  #4 (permalink)
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It sounds like your injectors are toasted same thing happened to my 02 lb7 started running like a dog got home parked and next I know all the oil and about 5 gallon of diesel mix was everywhere and the cause was the injectors
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Old 02-13-2012, 10:59 AM   eBay Motors  #5 (permalink)
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It still runs like a champ, Thats what makes me think other than injectors.
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Old 02-13-2012, 11:06 AM   eBay Motors  #6 (permalink)
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Are you seeing any drop in oil pressure ? Or any white smoke in your exhaust?
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Old 02-13-2012, 11:11 AM   eBay Motors  #7 (permalink)
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Definant drop in oil press. Got an autometer gauge, went from 50-75 down to 25psi. Because the oil is so thin i'm guessing.
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Old 02-13-2012, 11:16 AM   eBay Motors  #8 (permalink)
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Let me know the outcome of what you find I'd like to know. Good luck
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Old 02-13-2012, 11:42 AM   eBay Motors  #9 (permalink)
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When injectors are worn, they leak fuel and that fuel winds up in the crankcase and dilutes the oil. Common problem for the LB7 engine. Suggest you look in the LB7 section of this Forum and read several pages of injector problems.

Sorry, it should not happen, but that is the facts.
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Old 02-13-2012, 12:01 PM   eBay Motors  #10 (permalink)
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The thing to that is I just put a head gasket in it a month ago (3k miles) and sent the injectors off to have them checked at Industrail Injection, so I don't know how they could be already messed up, but I guess anything's possible with MY LUCK!
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