2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 221Get this manual
1F-2 Engine Cooling System:
General Description
Engine Coolant Description!
Fig.1: Engine coolant density-freezing point curve
B933H21601001
CAUTION
Use high quality ethylene glycol base anti-freeze, mixed with distilled waterDo not mix an alcohol base anti-freeze and different brands of anti-freeze Do not put in more than 60 anti-freeze or less than 50(Refer to Fig1 and At the time of manufacture, the cooling system is filled with 50:50 mixture of distilled water and ethylene glycol anti-freezeThis 50:50 mixture will provide the optimum corrosion protection and excellent heat protection, and will protect the cooling system from freezing at temperatures above 31 (24 F)If the vehicle is to be exposed to temperatures below 31 (24 F), this mixing ratio should be increased up to 55 or 60 according to the figureAnti-freeze Proportioning Chart Anti-freeze density Freezing point 50 31 (24 F) 55 40 (40 F) 60 55 (67 F)