its possible you have low oil pressure from the oil pump bolts falling out. If this continues it could lose the pressure that holds the timing chains tight which can lead to disastrous results. A ticking noise with the windows open isn't good, at idle not bad but should go away when driven. Possible that the oil is too thin too but the pump bolt thing is way too common with the V8s.
95 E34 530I V2.37
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