Originally Posted by Sydwayz

You do not want to spray fogging oil in the intake of an EFI or any fuel injected engine. Many, many posts on this in the past that will provide valuable information.

To fog an EFI engine PROPERLY, you can either:
Mix up a 2-stroke batch of gas and run your engines on this small tank while running the AF through or...
Remove your fuel/water separator; pour out half the gas, fill it with 2-stroke oil, reinstall and run your AF through the engine.

Many people will say "I've done it for years" referring to spraying fogging oil in the throttle body, but you are NOT protecting the entire fuel system if you do this, and you run the risk of gumming up sensors. Such is why the above procedure is referred to in Mercury Service Manuals.

Again, do a search. 100s, probably 1000s of good posts/threads.

Oh, and please no more talk about this crap until November.

Originally Posted by drpete3

btw. My blocks would already be cracked if I waited till November

Originally Posted by Too Stroked

Think of it this way. The only way to truly guarantee you've protected your block from freezing is to drain it. If you want to refill it with antifreeze as added insurance, that's cool. When you try to fill all of the cooling passages in your system with a perfect mix / concentration of antifreeze, it's pretty difficult to guarantee you've got it right. In the words of Clint Eastwood, "So kid, are you feeling lucky?" I'd always try to drain it first - no matter how hard it is. Just my 2 cents.

Originally Posted by easyrider1340

I drain the blocks / headers, remove a few hoses to ensure they are free of water (inc sea pump hoses). Then reassemble everything. I then remove temp sensor and fill with pink antifreeze.