Am changing plugs on 2006 aveo. Found oil in the

Was the right oil used? Happening before oil change? Have the computer scanned & ck for any codes. Poss reacting to cooling system. Cam & crank sensors etc.

If it was running properly before you changed the spark plugs and wires, check to be sure you have the wires routed properly from the coils to the plugs - correct wires on correct coils. It sounds like you may have a couple of wires crossed. Also, some engines are particular about the type of spark plug used. Check with your local Chevrolet dealer to see if the type plugs you used have been known to cause problems with the engine.

Could be a misfire in one of the cylinders try changing your spark plugs

The oil is probably leaking into the spark plug wells from the seals at the bottom of the pipes that constitute the wells. The wells may pull out with the plugs removed and have a seal at the top, but the bottom of the pipes may have been damaged if they are held in place by the plugs. Another method is to hold the pipes in place in the head with 'o' ring seals and these may have developed a leak, allowing oil from the tappet cover to get into the plug well.

You have oil in the plug holes because the seals that are supposed to keep oil out are leaking-you need to remove the valve cover to replace them.

i use brake cleaner or even a electronic parts cleaner to clean leaking oil out of spark plug holes and off the plug wires as well and when your done start the motor and run it till it stops smoking the you will be fine.

I have the same car, with 94k. seems to be oil coming out just above the manifold and my engine is misfiring like crazy when the engine reaches normal temperature. I am guessing valve seal gasket or valve cover gasket is bad. pull your plugs and see if there is any oil on them, if so replace the plugs and wires and definitely figure out where the oil is getting in at....again this is the problem I am having but I hope it helps you too.. also CHANGE THAT TIMING BELT AT 50K! trust me!

when run with a misfire, the cat will get loaded up with fuel, it takes awhile for it to burn out, and a code may set, on some occasions it ruins the converter, try clearing it and running it

The valve cover has rubber o-ring seals that fit into the valve cover and seal oil out of the spark plug wells. Over time, they get hard and shrink, allowing oil to enter the plug wells from the top of the engine. You need to remove the valve cover and replace the valve cover gasket and o-ring seals. The seals should come with the valve cover gasket set.

Hope this helps,
Dave

the grommets seal the lead from any water getting in and around the plug and creating a miss in the engine, you will have to use a little force to move them as they are a reasonably snug fit.
Once the lead is removed use compressed air to blow out any dirt that may have entered the area around the plug as this will fall into the cylinder when the plug is removed. you will have to use a spark plug socket with the rubber in the top to grip the plug as it is difficult to get the plug out unless you have long nosed pliers as they are down in the hole