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					Originally Posted by  Dale_K
					 
				 
				Try removing the oil fill cap while the screeching is going on.  It would be a test for excessive vacuum (bad AOS).  Probably not the issue but the test is so easy it's worth a shot. 
			
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I recently replaced my AOS.  No difference in the startup squeal.  Btw, my squealing started >10k miles ago.