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Discussion Starter · #1 ·
I am going to winterize my engines (merc 350"s) for the 1st time. In the past I always had the marina do it.
I went to purchase some antifreeze at West Marine and noticed they had a -60 and a -100 antifreeze. The -100 was about twice the price of the -60. Is it necessary to spent twice as much to be safe or is that going overboard for this area?
How many Gallons do I need for each engine? I am going to winterize by pumping the antifreeze into the outdrive water pickups. I will be pulling the drain plugs on the engine 1st to drain the water.
Any other suggestions?

Thanks!!!
 

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Discussion Starter · #9 ·
Thanks everyone for your advise. It looks like I will go for the -100 antifreeze. I drained the water out of the engines sunday (thru the drain plugs & mufflers). I will run the antifreeze thru it this weekend. Thanks again.
 

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Thanks Bill,
I also was told if you drain the block 1st then when you pump the a/f thru the outdrive the block will fill up with a/f. Since I drained the block all ready I think that is the way Iam going to do it. When I am done I will pull the plugs on the block to see if a/f comes out.
You are right, if you don't drain the block you must heat up the engine 1st. Thanks for keeping an eye out for me.
 

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Discussion Starter · #13 ·
I'am not quite sure how the engine fills up with a/f 1st while the thermostat is closed. Hopefully me trying to save a few bucks now won't cost me several bucks in the spring.
 
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