Merc 3.0 Sterndrive Winterizing Question

[CayugaCobalt]

When I had my 3.0, I just used regular antifreeze after draining the block. The idea was to push out any left over water a give some rust prevention or at least slow it down..drained it in the spring and disposed of it properly. No reason to make rocket science out of winterizing.

That's a valid method too.

 

[CayugaCobalt]

This. If you're running warm salt water through there all summer, you think the corrosion is happening after it's been flushed with fresh water and is sitting dry in the cold?

No, I dont think corrosion is happening on my engine after its been run in a freshwater lake, drained empty and sitting dry in the cold. I have put this cheap alcohol based anti freeze in and will not drain it so it doesnt affect any rubber and can mix with any little pockets of water that might be in there after draining.