went into garage saw oil on floor got my light out to investigate, saw oil drops on outlet side (passenger) of intercooler on the rubber? hose coupler connecting the 2 cast alum. pipes thought i could tighten clamps but you need houdini to get to them! the truck is 04 lly 12000 miles no motor problems-yet just the junk gm interior rattlin' never had to add oil never towed or hauled bone stock except for 305s' is it normal for oil to be in intercooler?

Yes.

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.

.

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).
.

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)

.

So, I wonder how long it will be before LLY's start running away from the oil. Lets see, the '01's and '02's get extended injector warrenty, wonder if the '04's will get extended engine warrenties for the runaways. Sorry '03 guys, your trucks are fine.

Jim

as always...Max is on top of things!

2005.5's come with quick release oil drain valves on the intercooler (not the engine yet) and an interval warning on the DIC to prevent the possibility of diesel runaway. The owners manual states to have a catch basin of at least 3qts. for draining. thanx geo.

2005.5's come with quick release oil drain valves on the intercooler (not the engine yet) and an interval warning on the DIC to prevent the possibility of diesel runaway. The owners manual states to have a catch basin of at least 3qts. for draining. thanx geo.
Are you serious? Wonder if they are going to retrofit the '04.5's and early '05's.

Jim

Sorry, I was just pulling peoples legs. I commented on this back in the fall and came up with my own solution and dump crankcase fumes and slobber to the atmosphere. I thought it was more important to me than the EGR valve before winter set in. thanx geo.