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I had the same issue, I did some research and found that the MTF for the M4 is the new LT-5.
The LT-5 bottle states that it is comparable/compatible with performance levels of the GL-4 fluid that the MTF-LT-2 your looking for is.
Needless to say I picked up a few bottles of the new LT-5 at my dealer, and its been fantastic for the past 6 months.
It's possible BMW is replacing the LT-2 with the new LT-5, which explains the shortage.
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