Oil soaked Plug and Coil - Pre-emptive questions

[squeasel]

2003 3.0i about 180,000 miles - No SES but code P1344 = Cyl 2 misfire at startup.

Truck runs rough at startup and at various times during a drive.

Cleared code and it returned a day or two later.

Went to swap coils and found #2 coil/plug "well" with oil in it. Cleaned coil, and plug (it was oily at the threads but could have become that way when removed ... also noticed a bit of smoke at startup which is unusual so perhaps some oil entered the combustion chamber at that time as well).

I swapped coil 2 and 3 but kept the plug arrangement the same.

I will check results after a few days of driving.

Question: what are the possible causes of the the oil in the coil/plug well? I know that I mis-poured some oil recently and #2 is below the oil cap so I suppose that is a possibility. Could the oil have "seeped" upwards from the plug? (Bentley shows 18 ft/lbs for plugs. Is this correct? I would like to think I am pretty good with my favorite torque wrench). Could there be a crack in the well that allowed oil to enter from above?

Again these are anticipatory questions to aid in subsequent testing. All help appreciated.

[Overboost]

Originally Posted by squeasel

2003 3.0i about 180,000 miles - No SES but code P1344 = Cyl 2 misfire at startup.

Truck runs rough at startup and at various times during a drive.

Cleared code and it returned a day or two later.

Went to swap coils and found #2 coil/plug "well" with oil in it. Cleaned coil, and plug (it was oily at the threads but could have become that way when removed ... also noticed a bit of smoke at startup which is unusual so perhaps some oil entered the combustion chamber at that time as well).

I swapped coil 2 and 3 but kept the plug arrangement the same.

I will check results after a few days of driving.

Question: what are the possible causes of the the oil in the coil/plug well? I know that I mis-poured some oil recently and #2 is below the oil cap so I suppose that is a possibility. Could the oil have "seeped" upwards from the plug? (Bentley shows 18 ft/lbs for plugs. Is this correct? I would like to think I am pretty good with my favorite torque wrench). Could there be a crack in the well that allowed oil to enter from above?

Again these are anticipatory questions to aid in subsequent testing. All help appreciated.

Valve cover gasket would be my guess for the oil in the spark plug well.
Easy to replace.

[squeasel]

Overboost ... thank you. I will pay attention to that area. I did replace the valve cover gasket around Feb of 2016 but it is worth another check.