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					Originally Posted by  clickman
					 
				 
				I think you want the 10-40 if you're going with the Castrol.  Based on used oil analysis by a shop-owning member.  I'd use it but we only have the 5-40 available in Canada (go figure), so I use that. 
There are as many opinions on oil as there are on replacement IMS bearings.     
			
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Yeah i hear you on the opinions.  I used to use 5-40 castrol but I can't find it anymore, so I've been using 0-40.  It has the Porsche A40 certification so I think i'm alright.