[TigerOats]

I use 50% ethylene glycol based antifreeze and water and my coolant effect is about 50 % worse than pure water. Was getting a 10C differential with plain water and 15C with the mix. There is an increasing diff due to increasing viscosity as the temp drops. At -20C its about 17C. If you are using a submerged pump it may prove counter productive to use a larger pump. The actual increased output my be off set by the increased heat of the pump. I replaced my Maxijet 750 with the 1000 and my temps were 2C higher due to the fact that the 1000 is 14W and the 750 is 7W.