Oil found on coil packs and spark plugs

[EMF614]

I pulled the cylinder 6 coil/plug to diagnose a misfire and the hole was pooled with oil. I checked the other cylinders and all others have oil in them too. The 6cyl had the most oil so I assume that is what caused the misfire. Now I know a failed valve cover gasket would cause this but I replaced the gasket 3 months ago and it has not leaked anywhere else. The thing that stumps me is it is leaking from all cylinders, not just one. Is there anything that can cause a new vgc to fail or did I just get faulty parts.

[ilyafil]

Improper torque? Maybe?

[CELison]

sounds like vc gaskets.... Not sure where else it could come from

[DiscoPotato]

VCG definitely leaking oil into plug holes. Check the torque on the valve covers and PCV system.

[somebody5788]

It is the valve cover gasket. This is why despite what Audi and 80% of the forum members will say I use a very thin bead of silicone glue on the entire gasket. I also use the torque wrench on all of the bolts at least 3 times as they can click to torque before it has fully compressed the gasket and once you have them all done the ones you started with are loose again.

[A62TURBO]

Use silicone and let dry over night before using the car.

[EMF614]

Thanks for the replies guys. I'm aware the VCG is the cause but I am looking for a reason it failed early. I followed Bently torques and silicon application. Does anyone know if a failed PVC system could cause the gasket to fail? I am getting no codes other than the cyl6 misfire

[julex]

have you checked torque on two middle bolts that actually compress spark plug hole gasket? Have you replaced that one at all? There is no need for silicone anywhere but the corners, VCG compresses a lot when torqued down and seals very well.

[EMF614]

have you checked torque on two middle bolts that actually compress spark plug hole gasket? Have you replaced that one at all? There is no need for silicone anywhere but the corners, VCG compresses a lot when torqued down and seals very well.

Yes, the middle part of the VC gasket was replaced and torqued properly. The whole VCG is getting redone today but I am hoping the leaks were caused by faulty parts. I just do not want this to happen again.

[Delmed83]

What if failed check valves are allowing boost to get into the valve covers? Which, in turn, blows though the gasket?

[EMF614]

What if failed check valves are allowing boost to get into the valve covers? Which, in turn, blows though the gasket?

Good point. This seems plausable to me. Are you thinking a bad check valve in the spider hose? Now that I think about it, when i ran my engine last, i heard an air hissing sound from the back of the motor near the pancake valve. Maybe it is shot?

[airjawed]

If the PCV system is failing then you would probably have oil leaking onto the manifold and around the engine and not just in the spark plug hole. Is there oil anywhere else? Both banks? Boost gets into the valve covers via the N75 atmosphere line too so you can't stop that...but a faulty check valve will cause boost to enter just during positive boost.

[EMF614]

If the PCV system is failing then you would probably have oil leaking onto the manifold and around the engine and not just in the spark plug hole. Is there oil anywhere else? Both banks? Boost gets into the valve covers via the N75 atmosphere line too so you can't stop that...but a faulty check valve will cause boost to enter just during positive boost.

It hasn't leaked on the ground since i did my VCG 3 months ago and I can't smell a strong scent of burning oil after running the car. The only oil I found was in the spark plug holes and it was present in both banks. I'm not understanding your post, is there something I can check? I don't have a pressure tester but I can make one tonight.

[xhackerekx]

Use silicone and let dry over night before using the car.

^+1

[airjawed]

It hasn't leaked on the ground since i did my VCG 3 months ago and I can't smell a strong scent of burning oil after running the car. The only oil I found was in the spark plug holes and it was present in both banks. I'm not understanding your post, is there something I can check? I don't have a pressure tester but I can make one tonight.

I guess what I'm saying is that I don't think this is PCV related. If it was you would probably find oil coming out the periphery of the valve covers. Both banks with oil in the cylinder spark plug holes sounds more like faulty valve cover gasket(spark plug part of the kit)....or the install went wrong somehow.

[julex]

I guess what I'm saying is that I don't think this is PCV related. If it was you would probably find oil coming out the periphery of the valve covers. Both banks with oil in the cylinder spark plug holes sounds more like faulty valve cover gasket(spark plug part of the kit)....or the install went wrong somehow.

In addition, pressurized crankcase would also result in rather generous oil clouds behind the car as the oil would seep through the turbo seal into exhaust and intake piping.

[happy2B5]

I have a somewhat related issue and am concerned of excessive crankcase pressure. No smoke other than burn off in engine bay. Lots of seepage out the front of engine though. New updated spider assay, vented oil cap, etc...

Time for full engine seal replacement, but concerned I'll just be in similar situ if I don't find why its leaking so much.