Ok i know what ur talking about the bearing hitting sound comming from the engine under high stress low rpm and then goes away after 3k rpm, i have that sound 2 and my car only has an oil cooler, i belive its normal sound due to LOW rpm HIGH stress, any engine does that sound Ex: my dad has a hybrid civic when he stops engine is off when he presses gas and he puts the pedal innnn the engine starts and allready in gear under immidiate stress low rpm u can also hear the bearing sound, but after it reaches higher rpm it goes away, it did that for the last 75k miles and still i hear it also so does my z since i bought it 18k miles.
Am not saying am an expert nor i know exactly what ur sound is, but the description maches.
Anyone plz correct me if am wrong.
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