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			It's likely the O rings, but all 6 at the same time? 
 
It's just as likely that the plugs were not torqued properly the last time they were out or changed. 
 
O rings are cheap, so at 60k mi., I say replace them. Tubes should be on an as needed basis - read cracked.  Otherwise they're inert and there's no need to change them. 
 
Cheers!
		 
		
		
		
		
		
		
			
		
		
		
		
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