X2 on the Marvel M Oil soak. It worked for me. It will work if you have sticking carboned up Rings; assuming none are broke. The main thing is it is available and cheap so if it does not work you are not out much money.
Here is one of the threads:
http://www.peachparts.com/shopforum/showthread.php?t=258757&highlight=Marvel
All the other stuff the other members mentioned is also all good.
I would add a Valve Adjustment to the above. It won't stop Oil burning but could help with compression.