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The issue is the aluminum blocks, and the thin cylinder coatings they use combined with the typical BMW salesman/buyer combo. BMW is one of those companies that does the "lifetime" fill on the transmission, despite technically only having a service life of 60k miles or something like that, "no break in", and myriad other little things that all pretty much add up to oil consumption. Pretty much sets the cars up to fail. I'm sure it's possible to have one not burn oil, but it's very uncommon. My 330i was pretty decent, and only burned about a quart/5k. I change my oil on the fives, so it worked out well for me.
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