Oil on your plugs can be from either oil coming down the intake valve guide or from the rings. I would remove the plug and put the cylinder to TDC and put air in the cylinder and see how much air you get out the breather. you can buy a leak down tester. or put a valve in a hose off a preasure regulator. Do it on wet and dry cylinders. I mark the cap base with the cylinders I want to check then use a piece of plastic to get it to the top. That way if you get air from the intake you know you have a bad intake valve, if it is out the tailpipe it is a bad exhaust. A week or dead hole will give you oil also. If it is just out the breather then it is rings. Compare the differences, then you have more information to make your decision. Just a thought!
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