Hello. I own a e53 x5 3.0i that just hit 200k miles. Its been doing well this past year or so but I just noticed a weird howling noise from the rear when accelerating at 55mph+. Its intermittent. I know its not the wheel bearing.


The sound isn't there when accelerating at low speeds. I changed diff oil last year and transfer case oil 2 years ago. Maybe its a exhaust leak? i don't know. Ill try and record it the next time it happens but is there anything I could check?

Thanks.