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I figured you might say that. So here is my retort. Just because BMW changes their fluid recommendation for the same chassis, model and years from one year to the next doesn't make their previous specification invalid. In other words if it was good for F30s and F25s up until 2015 (and they have the same front differential part number) then it's still good today. Who knows what motivations changed their specs? Could be a new relationship with a new oil company?
Also if you look at the rear diff some publications/tis versions/ISTA+ versions they changed the rear fluid from BMW SAF-XO to Hypoid G3!
Also I might add every single online site I can find online shows same fluid for front and rear for the F25/F30. ECSTuning, Turner Motorsport, BAVAuto, FCPEuro, you name it.
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