My mid 80`s +8 was subjected to a nut and bolt rebuild circa Y2K and at the time Automec SBF DOT 5 brake & clutch fluid was used.

Aprently this fluid was developed for/by the US military for use in their vehicles.. ?

I have owned my +8 since 2002 though only driven circa 28k miles in that time in the heat of the Med in mid summer and occasionally in the snow of Wintertime Scotland ... I have neither changed or topped up my clutch fluid..

A year or so back I replaced the brake fluid having stripped the front calipers to replace holed rubber dust covers and decided to remove the pistons while at it. No corrosion in the bores or pistons other than in areas exposed to weather as the result of the holed dust covers. There was no need to strip the rear wheel cylinders as they were free clean and fluid tight thus operating perfectly..

I like the idea of non-hydroscopic brake fluid, it has worked so far for me.

Your results may vary..?