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Old 20 November 2013, 04:50   #1
Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
Winterizing a 4 stroke

Hi Guys. is there any advantage of running antifreeze through a 4stroke ?
I am cool with the ususal winterizing ie spray down and fogging oil etc.

but Antifreeze I have never done on my outboard.

any suggestions

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Old 20 November 2013, 06:29   #2
steco1958's Avatar
Country: UK - England
Town: West Bromwich
Boat name: Ellie V
Make: Excel Voyager 520
Length: 5m +
Engine: Evinrude 75 HP
MMSI: 235 908 287
Join Date: May 2012
Posts: 685
Anti-Freeze, is only used in an enclosed water system such as your car radiator, I really cannot see any point in running it through an outboard.

just make sure you flush the engine correctly to remove all salt and ensure you allow to drain.

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Old 20 November 2013, 18:12   #3
Join Date: Sep 2013
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I've seen You tube videos where they show winterising 4 strokes. Some show antifreeze being put through and some don't so unsure what's best to do. There would only be an issue if there were areas inside the engine that trapped water which could damage the engine if it froze. Presume running antifreeze through would be a "belt and braces" job to overcome that issue.
I've started using a product called Bluthru which is a flushing agent that's supposed to get rid of salt, lubricate and protect the inside water ways to help stop corrosion. Anyone used this or something like it... Trouble is you can't see if it's doing anything
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Old 21 November 2013, 02:13   #4
Country: UK - England
Town: southampton
Boat name: hydradrive
Make: yamaha
Length: no boat
Engine: sterndrives
Join Date: Sep 2012
Posts: 290
Put it fuel stabiliser , run engine on fresh water until it's reached temp , if it's on carbs run fogging oil through it and drain carbs . If fuel injection remove plugs an squirt it fog bores an turn engine with plugs outs , replace plugs an drain fuel vaporiser . Keep out outboard in upright position so it self drains . Remove prop a. Place bag over lower unit to stop air travelling up the exhaust . Blank the exhaust pressure relief on the mid section hope this helps .
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Old 21 November 2013, 11:18   #5
Huib1965's Avatar
Country: UK - England
Town: Southsea
Boat name: RIB GLADYS
Make: AVON
Length: 4m +
Engine: Mariner 60HP EFI
Join Date: Aug 2013
Posts: 113
Flushed the engine with muffs and keep upright to let excess water out, Added Quicksilver Quickstor to Fuel, Changed the Gearbox oil and done !.... Read that I should not use fogging oil on my Mariner 4 stroke so wont.....
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