Spark plug inspection
Seasoned HDF Member
Joined: Mar 2010
Posts: 20,952
Likes: 7,483
From: Poolville
First time you mention oil on the threads.. Could be valve seals.. most common are the exhaust valve seals.. You could always pull the exhaust and have a look at the valve stem and guide to see if oil is infact getting sucked in..
HDF Community Team
Joined: Aug 2018
Posts: 2,994
Likes: 1,174
From: New Hampsha
So, are we talking 100 miles, or around the block?
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