Black sludge or oil from head
On my recently acquired bolens snowblower, I found That the cylinder head was leaking black sludge or liquid from The head gasket. The compression feels fine and it still starts up and runs fine but is it a head gasket leak?
Why don't you see if the head bolts are loose?? Do you have a torque wrench?? Looks like oil creeping up that head bolt, possibly not tight enough. Not saying there isn't head gasket damage, but if it's running and starting fine, tackle that job in the spring.
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