2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 22Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 22

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MAINTENANCE
After Each Use
1 Flush out the outboard cooling system if operating in salt or polluted water2 If operating in salt water, wash off all salt deposits and flush out the exhaust