If this were due to sloppiness, I'd expect that under the cover would be
with oil. You can also look at the oil itself. If it's clean
like it just came
out of the bottle, it's likely it was spilled. If it's
dirty like the oil that
you normally see on the dipstick, it's leaking
from the engine.
Go ahead and remove the plugs and let the oil drain into the cylinders.
all the plugs out and the coils disconnected to prevent inadvertent
place rags over the holes and crank the engine for a few seconds.
dispel enough oil to prevent a fluid lock-up of the engine. Then
wipe the plug
tube walls clean and install new plugs and wires. When you
start it, it'll
smoke from the exhaust until the oil in the cylinders
burns off. A hard test
drive of a mile or two will probably get rid of it
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