Hynautic Shift & Throttle Control Fluid 

The fluid recommended for use in Hynautic engine controls is a 50 / 50 mixture by volume of distilled water and ethylene glycol. The type of ethylene glycol used is very important for proper operation of your system. Some additives in other fluids will clog the elements in the synchronization valve.
NEVER USE STOP LEAK TYPE ANTI-FREEZE OR
HYDRAULIC STEERING FLUID IN HYNAUTIC ENGINE CONTROLS.
HA5455 Hynautic fluid is proportionately mixed, filtered and ready for use.
Hynautic Shift & throttle control fluid is required for your Hynautic engine controls. Use of other fluids will void your warranty.