Q: Engine noises at higher rpms.

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this is regarding about my Hundai terracan car model 2004 with 236000milage.i feel some sound like turbo when i press my foot on the gasoline and Rpm cames upto 150/160rpm.but on 100/130rpm i cant feel any sounds.what is the main cause of this sounds.is there any posibilities that my engine crankcase/crankshaft is something Worn damage rather bearing broken? and also can i still used/drive it when sounds is bad but not too noisy my car still running fine thanks for you advise more Power...

My car has 236000 miles.
My car has an automatic transmission.

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