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When we bought our 4 year old F, the first thing I did was to replace the brake fluid. Used NAPA DOT4.
AFTERWARDS, I noticed the LV (Low Viscosity) recommendation.
Needless to say, we didn't experience any issues...So we DID use the same DOT4 fluid in there on the next replacement. <---remember, brake fluid absorbs moisture, so you should go by TIME not MILEAGE. I have assisted others who needed to refresh their BF at track events (HPDE)...