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Hey guys, I have a 2013 optima sx I get a whining noise as I accelerate, it starts about 25-30mph. If I cruise at steady speed it stops if I accelerate it starts and if I take foot off gas I can hear it. It’s not rpm related so it’s not motor or transmission tone gets higher as I accelerate but doesn’t change with transmission shifting and if I accelerate hard it still doesn’t happen until about 25-30mph, I’m thinking bearing but can’t identify which wheel, any help would be appreciated .
 
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