OAT only or a coolant water mix?

Finally getting around to doing a coolant change and over here in Spain OAT means nothing to any motor factor I've visited.Is it just the organic variety of coolant,or will any decent quality coolant do?

Wise move I think....still haven't gotten around to it yet!

It does,read some horror stories online of the problems getting it out if it breaks.Getting a slot head screwdriver red hot was one.

Seems it's all plastic....I'm doomed.

Going to go the safer route with an additive.99 Octane isn't available anymore in any of the local stations.

Finally going to get around to doing the coolant change.The drain plug at the bottom of the radiator seems to have a plastic (handle?) bit tight,so does anyone know what size thread the plug is so that I can have a bolt handy if it breaks.

I'll give it a try and report back.

That's the way for me then.