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, Etc.

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post #1 of 21 (permalink) Old 02-13-2012, 11:40 AM Thread Starter
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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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post #2 of 21 (permalink) Old 02-13-2012, 11:46 AM
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line leaking?

Trevor
2004 GMC LB7
Low and Slow
EFILive, Stock Trans and DJM 3-5 drop
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post #3 of 21 (permalink) Old 02-13-2012, 11:50 AM Thread Starter
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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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post #4 of 21 (permalink) Old 02-13-2012, 11:55 AM
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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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post #5 of 21 (permalink) Old 02-13-2012, 11:59 AM Thread Starter
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It still runs like a champ, Thats what makes me think other than injectors.

Chance
02 2500HD LB7 4x4-
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post #6 of 21 (permalink) Old 02-13-2012, 12:06 PM
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Are you seeing any drop in oil pressure ? Or any white smoke in your exhaust?

11 cclb dually
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post #7 of 21 (permalink) Old 02-13-2012, 12:11 PM Thread Starter
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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.

Chance
02 2500HD LB7 4x4-
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post #8 of 21 (permalink) Old 02-13-2012, 12:16 PM
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Let me know the outcome of what you find I'd like to know. Good luck

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post #9 of 21 (permalink) Old 02-13-2012, 12:42 PM
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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.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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post #10 of 21 (permalink) Old 02-13-2012, 01:01 PM Thread Starter
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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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