I would be surprised if it's anything different on the E70 or any other BMW they probably use the same sensor and o-ring. When mine leaked I wrapped some Teflon tape around it as a "temporary" solution but after buying some o-rings I never bothered to replace as the Teflon has been holding for over half a year now maybe nine months

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)