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  1. 4G (2011+) Optima
    Hi all. I own a 2012 Hybrid and I realized that the HSG belts were due so I decided to switch the belts. (2 belts) and I bought both belts from Rockauto and the brand was Bando. After changing the belts, everytime when the engine revs from 0, it made squeaking high pitched noise for 0.1 to 0.3...
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