Did you actually read his post ??

He's already had a refund once, then negotiated a new price $5k below the original and had it shipped 2000km from the dealer to his home. I don't imagine the offer of another refund is on the table.

I don't know what prices are like over there but here in the UK the Sterling equivalent of AUD5k is enough to get a 'box reconditioned by a specialist. Maybe get it checked over - by a transmission specialist, not the BMW dealer - to see if they find anything amiss, then I say drive it, enjoy it, and deal with it if it becomes a real problem.