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I don't know if anyone is really sure if it is or isn't better since it is "newer", that is just speculation that bmw spent time to upgrade materials for an older car part.
Being speculative, I would think you are right that they upgraded the material due to complaints and it failing for so many people.
However, with that said, looking at the oem versus the synthetic version, the synthetic looks of much higher grade material that should last longer. I am sure if someone felt both of them side by side, they would side with the synthetic aftermarket ofhg.
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