My rule of thumb is to use a manufacturers oil.  These guys know that they have to warranty their motors so they have a better quality oil. The Walmart in my town has the Quicksilver and the Evinrude xd-25 for @ $22/gal.  We've always referred to Penzoil as "yellow death". The last advice that I have is that if you are still using the VRO, premix a little oil in your gas as insurance.
		 
		
		
		
		
		
		
			
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				1975 V-20 w/1996 225 Johnson
			 
		
		
		
		
		
	
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