Coolant Mix

[Carl Pattinson <carl@flyers.freeserve.co.uk>]

Does anyone know the correct mix ratio for engine coolant in the Rotax 912. My
owners manual says 100% ethylene glycol but I have been told that a 50% mix is
better for cooling.

Could someone put me straight on which is best.

Also any views on engine oils (organic/ synthetic). Funny but Tesco only sells
oil in the Organic range ! I was intending to use a 50/50 synthetic mix but cant
give a reason why.

Carl Pattinson.