Acura 2009 RL Owner's Manual page 466

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5. Put the radiator cap back on, and
tighten it fully.
6. Pour coolant into the reserve tank.
Fill it to halfway between the MAX
and MIN marks. Put the cap back
on the reserve tank.
7. Reinstall the lid.
Do not add any rust inhibitors or
other additives to your vehicle's
cooling system. They may not be
compatible with the coolant or
engine components.
2009 RL
Engine Coolant
463