Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
If it is for a fact engine oil I would suspect like stated above that it has enough wear or a defect in the surface of the crank hub to require a sleeve. Outside chance could be that for some reason the hub has to much radial run out.