MX5Ireland

Howye lads, So my radiator sprung a fairly substantial leak on Friday, given its age and condition I've decided to just replace it with a new one. Just want to make sure everything's right this time around so what coolant should I be using, OAT or Silicate?
Seen a lot of contradictory posts when I went looking online so does anyone on here know for sure which to use?
Its a mk1 93 1.8 eunos roadster.
Also will motor factors stuff do just as good or should I go to Mazda for it?

Howdy, I've always used the motor factor sourced green ethyl-glycol coolant

As above, ethylene glycol cilicate free coolant. I use 65-70% water to 35-30% coolant.

Thanks lads!