Freezing Yamaha pipes

[Shadow]

My RHIB is on driveway at moment but I like to run it every few weeks. With the cold weather today it was clear that the rubber pipes feeding water around were frozen (no tell tale). I let them thaw out a bit and all is fine but...i then thought if I can get some anti freeze into these pipes it would help prevent issue from occuring again so I connected up the device i use to clean the inside of engine and feed pure anti freeze through the water way. Can any one see any issues with this???

[willk]

Don't know about the engine, but beware any pooling antifreeze on the ground - pets are known to drink it and die horrible deaths.

[Shadow]

No probs. Environmental issues dealt with but good point!

[Steve509926]

I'd use a 50/50 or a 60/40 water mix. Ethylene or Propylene glycol undiluted is very viscous and there is a danger that the very small pipes could become blocked.

[69cmw]

Why do you run it every few weeks? I’ve never ran any of my outboards over the years unless I’m away to use it, never had any issues either.
1 of my engines I had from new and had it for 24 years.