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Although it isn’t for the faint of heart, you can fit a drain plug to a BMW diff, but it takes some machining. My Caterham uses the “small” BMW diff casing. I think the M235i and M240i use the “medium” one. Here is the operation to machine a flat and drill and tap a hole for a magnetic drain plug, there is just enough space to fit the drain plug and enough casing thickness for the thread:
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