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			#1  
			
			
			
			
			
		 
		
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			I searched the threads and found little on answering this question.  What oil is used by members in their V6's.   My default on everything I own is Castrol, but maybe I might want to use something different on this engine.   
		
		
		
		
		
		
		
		
	
	On all my older flat tappet engines I use an zinc additive, is this also recommended? thanks all, gg  | 
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			#2  
			
			
			
			
			
		 
		
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			That is a great question! I can't wait to see the responses. I was thinking of trying this because of the "boosted zinc"... 
		
		
		
		
		
		
			![]() ...but will wait to see what folks here are already using. 
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			#3  
			
			
			
			
			
		 
		
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			The standard I've heard is Rotella 15w 40. Here's the additive I used, recommended by Jay Leno for old cars with flat tappets. You just put a little in. 1 bottle lasts a few changes.  
		
		
		
		
		
		
			http://6066gmcclub.com/forum/showthr...&highlight=oil Here's my thread asking the same question too when I was to that stage. http://6066gmcclub.com/forum/showthr...&highlight=oil 
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			#4  
			
			
			
			
			
		 
		
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			I have been using this additive for my older cars.  I did notice on one of them it quieted the motor and oil pressure was staying higher at idle than before.   
		
		
		
		
		
		
		
		
	
	http://www.amazon.com/Maxx-Additive-...&keywords=zddp On the Rotella, which one the T or the synthetics? I was reading the specs, seems the T would be best for our trucks.  | 
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