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If you're going to mix new tyres with roughly 8mm of tread with used tyres that are already down to 5mm that's a 3mm difference (and potentially I think that's starting to get marginal with X-Drive).
As an aside, I'm surprised you've experienced such a difference in wear between the axles - the tyres on my 335d have always worn at an almost identical rate and hence come replacement time it's been a case of changing all four and not just a pair....
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