When installing new exhaust on wcc's 930, we ran into the same problem.  We had no choice but to loosen the bottom line to get access to the top. We tried every other method suggested with no luck. 
We used copius amounts of Kroil and were lucky enough to get it removed without any damage.
 
Found this thread:
 Oil Line Replacement Help Needed - Oil Tank to Thermostat.
		 
		
	
		
	
			
			
		
		
		
		
		
			
				__________________ 
				1981 911SC ROW  SOLD - JULY 2015 
 Pacific Blue 
 
Wayne
			 
		
		
		
		
		
		
						  
				
				Last edited by Oh Haha; 06-08-2009 at 05:52 AM..
				
				
			
		
		
	
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