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Usually oil accumulations on the exterior of an engine are the result of oil being spilled on the engine, or a leak in one or more of the engine gaskets.
Assuming that by "spark plug well" you are referring to the recessed area around the exterior portion of a plug [s] thus above the spark plug in the engine head, and that the spark plug [s] is/are tight [torqued properly].
IF that's the case, I suspect one of two probable causes:
- Someone spilled oil on the valve "rocker cover" above, and the oil migrated downward [via gravity] and was trapped in the well.
- Another possibility is that the gasket under the rocker cover is leaking.
What else can I help you with?
What might cause a Chevy trailblazer from cranking after changing the spark plugs?
What huh?
How do you change the spark plugs on a 2002 Chevy Trailblazer?
How do you change the spark plugs on a 2002 chavy trailblazer
Coil pack or spark plug on 2004 Chevy Trailblazer?
spark plug
What are the specifications for the spark plug gap in a 2004 Chevy Trailblazer?
.043
What spark plug for 2004 Chevy Trailblazer?
AC Delco iridiums
What would cause a 2002 Chevy Trailblazer to misfire?
Bad spark plugs, coils are coil, bad injector. Cam are crankshaft sensor
How to determine if a spark plug is bad in a 2002 Chevy Trailblazer?
If the car will not start...the spark-plug is bad.
Are there spark plugs on a 2003 Chevy Trailblazer?
ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
What spark Plugs are used for a 2004 Chevy trailblazer 4.2?
AC Delco Iridiums
Location of spark plugs 2004 V6 Chevy Trailblazer?
follow the plug wires they are on the heads
Where is the coil pack on a 2005 Chevy Trailblazer?
The 2005 Chevy Trailblazer has Coil-On-Plug ignition coils so there are 6 "coil packs". Each one is mounted on top of the spark plug.
Where is number 2 cylinder on Chevy Trailblazer?
That's the forward-most spark plug on the passenger side.
