so i just flushed my coolant and it says that ineed 6 gallons to fill my radiator backup..howcome im only able to fit 3 gallons?

 

Its almost impossible to manually flush all the fluid out. To get it all you would have to disconnect all coolant hoses and plugs from the block plus blowing out the heater core.
I just keep flushing until all the water that comes out is clear.

 

alright thanks, i thought i did somthing wrong