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I personally don't know about the 24000 or 2 years. Mine is every year for free since I bought it. However, I agree with OP, winter is harsh so I am replacing my oil in the spring and in the fall as well. BMW pays the spring one, I pay the fall one.
I heard all kind of stupid stories, it is dumb to replace the oil how BMW wants. The oil is the life of the engine.
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