When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Do a leakdown test... that will be the way to tell. Oil on the plug bottom IS an indicator of a bad ring or a bad seal so is the smoking while "hammering" it. Don't have to listen to me though... but I did already have a ring fail