winterizing

[Derekmcl]

If I have run antifreeze through the block, do I still need to drain? Just seems like an extra step that can lead to me forgetting to put them back in the spring.
Please let me know what you experience is

[speedysprocket]

How'd you run it? What engine?

[mmwjr]

It would help to know what engine you have.

How are you planning to run antifreeze through the engine? A winterization kit? If so be careful because if the engine is not totally warmed up the t-stat will not be open and no antifreeze will pass though the engine.

Not draining the engine allows the standing water to dilute the antifreeze some as it passes which reduces it protection from freezing.

I prefer to warm up the engine then drain the it then run antifreeze through it.

[Derekmcl]

Sorry . I have a 90 2700 scr with 5.7. Was going to run it on the hose until it warmed up. Then switch it to pure antifreeze

[speedysprocket]

Sounds like a good plan. My only concern was that you get anti freeze into the oil cooler (if you have one) as well, which your method would do.

[mmwjr]

"Pure antifreeze"

Do you mean ethylene glycol?

Not good for the environment if you just run it out in the spring.
Also un-diluted does not provide the best protection.

I recommend marine antifreeze that you can get good for -100F for less money.