Keep oil fouling #2,4.and 8 spark plugs have oil in the intake plenum, was told by a local dodge dealer to leave the bottem pan gasket off and just use silicon (the steel plate on the bottom) done that and still has oil down the throttle body and has a misfire yet,cleaned the intake very throughly when i had it off need to know of any other way that oil could be getting in there. maybe pcv valve, head gasket, dont know ive checked compression 125lbs each cylinder

The upper intake plenum is leaking coolant into the cylinder heads. The head gaskets on this motor are awesome. So, chances are it's the upper intake plenum. You can check this, by removing the vacuum hose that runs between the upper plenum and the brake booster. Stick your finger in and try to touch the top of the lower intake manifold. If your finger is wet it the upper plenum. You might as well replace the lower intake gasket while you're performing this work because they are prone to failure also. Use a shop vac to pull any coolant out of the cylinder heads. Get brand new spark plugs because the old ones are probably fouled. Once you get the plenum and gaskets replaced, remove your fuel pump relay and leave the spark plugs out and turn the engine over repeatedly for about 10 seconds to push any excess coolant out of the cylinder heads. Then, put the spark plugs in and turn the engine over for 10 seconds again. This will burn excess fuel as coolant out. Then, replace the fuel pump relay to allow fuel to be pumped into the heads. Car will smoke for a few when it fires up, but will clear out quickly. CHANGE THE OIL! Twice within a week if possible.

Does it look like this?

http://partimages.genpt.com/largeimages/618434.jpg (copy and paste in your address bar)?

If so that is called the plenum gasket, or intake plenum gasket. There are available aftermarket, places like NAPA should have or be able to get them. It is a common gasket to replace because of the necessity to remove the plenum to do a tune-up. NAPA gets about $7 for the gasket.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Change oil,replace spark plugs and fuel filter,air filter,check all brakes and lube caliper slides,check and flush cooling system,replace trans filter and gasket and perform a trans flush.This will replace all the trans fluid not just the fluid in the trans pan.Add fuel injector cleaner about every oil change.This will keep this vehicle going for another 100k.This is the best engine G.M. has had and will go over 300k.The biggest problem was the upper intake plenum gasket leaking coolant into the cylinders and oil system.Hope this has helped and good luck.

I see a lot of lower intake gasket leaks on these but usually you get an external leak or you'll find coolant mixed with the oil, not a misfire. Upper plenum is dry on the 3.1 and just bolts onto the top of the lower intake. We usually apply pressure to the cooling system overnight with the spark plug removed from the misfiring cylinder. If there is coolant in the cylinder come morning then you only have to figure out where it is coming from. If the plenum is removed during the test you might be able to see where the coolant is or isn't coming from with a borescope by looking down the intake runner.

They are under the black plastic cover that is in the middle of your valve cover gasket. Remove the intake hose from the aluminum intake plenum on top of the valve cover and the silencer box against the firewall. Remove all the connectors from the sensors which should be 2 on the plenum and the 2 large vacuum hoses on the plenum. Then remove the 3 12mm bolts from the plenum at the throttle body and remove the plenum. You can reuse the throttle body gasket at the plenum so don't destroy it. All the other bolts are 10mm and use a screwdriver to loosen the clamps on the hose. The sensors have clips that you need to remove with a small screwdriver, then disconnect them. Remove the bolts on the cover and the cover. Then remove the bolts holding the coil packs down. Do one plug at a time. 2 of them are connected to the 2 plug wires and 2 are underneath the 2 coil packs. The connectors on the coil packs are fragile so remove them carefully. Reverse the steps to reinstall the plenum, etc.

the upper intake plenum...you will have to remove the plenum to access the spark plugs...usually you are able to unbolt the plenum only and disconnect the front connectors and/or vacuum lines. and tilt the plenum up and out of the way to access the plugs... take care when doing this you can damage the engine if not careful. make sure you get a new intake plenum gasket...as well as the valve cover gaskets...the rubber rings that seal the spark plug tubes from oil tend to leak causing a misfire. you already have to pull the plenum might as well do the valve cover gasket while you are so far in it.

if it's 5.2 or 5.9 engine,the intake manifold plenum pan gasket may be drawing oil from lifter valley of engine..remove air cleaner and check down inside manifold with throttle plates wide open and look for oil pooling inside intake..if there is oil in there,you to remove intake manifold and replace gasket and bolts holding rectangular pan to bottom of intake..you will need intake gaskets as well..suggest going to dealer for parts..fairly inexpensive as well..i hope this helps

it sounds like the intake manifold plenum pan gasket is leaking..open throttle plates and look for engine oil pooling inside intake manifold..if there is,you have to remove intake manifold..there is a pan/cover bolted to bottom of intake..gasket will look like it's out of place..you need to replace this gasket and bolts..you can get these from your local dodge dealer..you will also need new manifold gaskets..this is causing your oil consumption and spark knock issues..there is also a software update for the engine controller for spark knock..let me know what you find

The best way is from under the vehicle on a lift, or you can jack up the vehicle and support it with jack stands. You can access the spark plugs between the fire wall and motor from under the vehicle..

Check Out your pcv

" Inspect the Positive Crankcase Ventilation (PCV) valve. Shake the PCV valve to verify that the pintle inside of the PCV valve is free. Replace the PVC if the pintle is not free"


and then check this Tech Service bulletin TSB 09-05-00 Spark knock and oil consumption due to intake manifold pan gasket oil leak. .
"If the intake manifold plenum pan gasket is leaking, an additional vacuum source will be created inside of the engine at the location of the pan gasket leakage.- Engine combustion blow-by gases, oil vapor, and air from the crankcase filter/breather may be drawn past the leaking pan gasket and into the intake manifold. In most cases when this condition occurs, an engine at idle will create the highest vacuum and lowest amount of engine blow-by."

All instructions for the test and fix are in the bulletin. Don't do anything to void your warranty this is for your information and knowledge.

Your oil manufacturer should not be an issue if it exceeds specs for your vehicle (most do)
The oil weight may be an issue if you are not using the recommended weight. (still unlikely)


Plugs are different definitely stay only with the manufacturer recommended for best performance

While 1 quart per 3000 may not seem outrages to some any oil leakage from a new vehicle should be unacceptable.

I cannot suggest any other recourse than these other than to make sure you have all your trips to the dealer documenting the complaint and the resolution or lack of solution. If you have tried all your resources to fix the vehicle it may be time for different direction and a different group of professionals.. So maybe yes to your question " there sumting wrong wit my truck???"