10-12-2013, 05:00 AM
I use one gallon per engine on my 8.3's in my 4000. Use a shop vac to clear cooling circuit ,you must open 2" raw water line after the sea water pump an vac till empty . Then remove 2" riser line , turn vac on and pull anti thru sys backwards . If you save the anti you can pour it in the mufflers after you drain Them . I vac all lines empty to save anti ,its not too hard but does take a little more effort .


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