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					Originally Posted by  Chuck W.
					 
				 
				If the coolant itself is milky, you are in trouble.  If it is just a film on the cap itself, no worriers.  This is usually caused by moisture and condensation. 
			
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It looks at the moment it is just round the cap and neck. I have wiped it all away to see if it returns. I do not use the car very much and it sits outside. How many miles would I need to do roughly to see if it returns. Fingers crossed 
Thanks for your reply