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That supposed document was nothing more than an error in labelling. At no time as bmw approved anything but 10w60 for use other than emergency top offs with a lower weight.
Again, you can't say any hydraulic lifter engine is the same. It's oil pressure that is key so if an engine is designed with a grade to begin with, the design would incorporate the oil pressure they targeted
We are changing oil pressure in an engine not designed for it. Whether it matters who knows
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