I have a 04' LLY and I found oil dripping from the lower passenger side intercooler duct, the hose clamp was a little loose and has been tightened.

Is it normal to have oil in the intercooler system?

Is there something I should be worried about?:confused:

Is that normal, Nope

Should you be worried, I would

I'd get it to the dealer.

See this thread...

http://www.dieselplace.com/forum/showthread.php?t=19342

Turbo Air Charge Cooler Hoses Oil Seepage , or Blows Off on Acceleration - kw black smoke boost noise turbocharger clamp leak oil LLY 6.6 whistle P0299 low intake surge no power #PIP3068B - (Nov 1, 2004)

Turbo Air Charge Cooler Hoses Oil Seepage, or Blows Off on Acceleration.

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The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:

Oil seepage from turbo air charge cooler hoses or hose blowing off during acceleration. Possible DTC P0299.

<LI type=1>Due to the closed PCV system on the 6.6 LLY engine, it is normal to have oil residue in the air charge cooler hoses and pipes. <LI type=1>The oil will migrate to the lower areas of the air charge cooler system and may cause customer concerns of oil seepage.
This may also cause the air charge cooler hoses to blow off when turbo boost is high.
Recommendation/Instructions:

<LI type=1>Do a visual inspection of air charge cooler connections and hoses. <LI type=1>Replace air charge cooler hoses, pipes, or clamps if damaged. <LI type=1>Properly clean all oil from air charge cooler pipes and hoses. <LI type=1>Air charge cooler hoses and pipes are marked for proper installation. The hoses are marked with ENG, DUCT, or CAC (charge air cooler) the hoses and pipes must installed correctly. The engine side is marked ENG, the duct side (the aluminum pipe) is marked DUCT, and the charge air cooler side is marked CAC. <LI type=1>Apply a very thin coat of sealer part number 97720043 to the air charge cooler hose connections.
Install hose and properly torque air charge cooler hose clamps to 8 Nm (70 lb in).
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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:

(04 05 6.6 LLY C2 C3 K2 K3 Chevrolet Silverado GMC Sierra) and (04 05 6.6 LLY C4 C5 D4 D5 E4 E5 Chevrolet Kodiak GMC Topkick)

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Thanks, for the reply.

Max, I read the info on the acceleration blow by, is this going the hurt the engine, or do I periodically drain and clean the hoses? I do have a lead foot.

Scott

depends on who much oil. I had a lly turbo go. put all the oil into the intercooler.a little is ok but dripping. Check the oil level.

Thanks Patrick,

I'll just keep an eye on it

Scott