Lynn, 
I can give you some 140 weight oil I have got for the Morris to put in it. 
To replace my steering box seal I cut a strip of cork and wrapped it round the sector shaft with a diagonal cut for the joint and pushed it into the housing. 
It has a light oil in the box and hasn't leaked but I am still going to change it to 140. 
Terry.
		 
		
		
		
		
		
		
			
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				Terry  
F30 13 Cab CMP 
Morris Commercial C8
			 
		
		
		
		
		
	
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