Quote:
Originally Posted by chris719
I would run DOT 4 LV or DOT 5.1 on the street. The viscosity of DOT 4 below freezing is typically approaching double that of DOT 4 LV. If you are doing track work then sure, just run your preferred fluid, but the ABS system is designed for a lower viscosity and I've felt the difference in other BMWs.
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Personally I only run my car in the summer when the temps are above freezing so I should be fine. Also the dsc/abs module is in then engine bay and should be warmed up by the engine heat meaning the fluid inside shouldnhe warm enough that the abs/dsc module valves are able to respond as quick as they need to.
Plus dot 4 brings in fluid with a higher working temp which is nice when you want to do autox, light track, and street useage on a single fluid. It saves the pain of flushing fluid all the time.