5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Since this is a moving-related sound, check for a rock or a nail in one of your tires. That's definitely one way. I also agree that exhaust is unlikely to make this kind of noise.
If you're coordinated enough to do this without crashing, in a safe location with no traffic, while you're rolling, pop the car into Neutral. Still get the sound? Then it's unlikely to be the driveline. Turn off the engine (YOU'LL LOSE POWER STEERING AND POWER BRAKES TEMPORARILY) Stiill get the tick? The engine's out of the equation. That should further isolate the problem.
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