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Conversion factors as displayed on the dial or at the rear :
W=0911: 0,911 = 4,10-differential (315) or 4,11-differential (316-1,6, 318)
W=0866: 0,866 = 3,91-differential (316-1,8, 318i, 320/4, 320i-1,8i)
W=0808: 0,808 = 3,64-differential (320i-2,0, 320/6)
W=0762: 0,762 = 3,45-differential (323i)