You're not confused but there is a BIG difference between 'Silicon/Silica dioxide and 'Fumed Silicon'. Think of fumed silicon as microscopic ball bearings! Not near the same as sand paper. For o-rings there is no better lube. I mix about equal amounts of tech-grade moly and either silicone grease or 10W silicone shock oil (even silicone brake fluid will work) plus a tad of my secret sauce. Over kill to the max for sure but I've been using it for years and I'm not about to stop now. Only the 'ware' stops on contact.
Maybe BMW want their cars to wear-out sooner rather than later. I'd would think BMW's use synthetic oil/grease etc. and most likely silicone brake fluid. You can bet they treat all the exposed rubber with silicone.
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