I did a search a few years ago when I bought my beast and found this product recommended by BMW.
Then found this at the local caltex.
Been using for 4 years now. Will be doing a nut blast at Pete's early January so I'll post back the results
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2007 E93 335i. Space grey. GTC-CS 19". Matte black grilles. Lux H8 160's. LCI Tails. KW V2. Cobb AP.
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