Quote:
Originally Posted by redrum22
Mine's making a quite high pitch whining noise as the speed increases.
I don't have much of a clue so asked a mechanic to take a look. He put it on a rack to listen underneath while accelerating and he said it's the diff making the noise and he thinks it's on the way out.
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BMW diffs will make that high pitch noise(only under part throttle cruising but goes away under power). It is from the customer not following BMW breakin guidelines. ie: not to exceed 170 kph(or WOT full load accel runs) for the first 1,200 miles. I have rented many (new) BMW's that have had that noise. It is no wonder on a rental.
I think I would first try replacing your diff oil. Then see how it sounds. Also take a look at the old fluid's condition and smell. Look for bits of metal and use a magnet to pick out any metal bits.
Dackel