My understanding is that DOT4 is a synthetic brake fluid and is what will be in your +8

Mineral brake fluid is only used in a small handful of cars.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10