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When you say it is 4 or 5 years old is this running years or boxed years? If its boxed years then running will help. there is a thread on here I cant remember where but it deals with this problem on some of the older athearn engines. I have a SD40-2 that is a couple of years old and it is not noisy at all. My older SD9 is like a singer sewing machine running around in circles.
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