How much propylene glycol for winterising?

[Poey50]

Thanks .. have modified my last post accordingly.

 

[JumbleDuck]

As far as motor vehicle are concerned my understanding is that you should be using an OAT type with aluminium radiators but a conventional non OAT type with copper and brass radiators.

The OAT stuff I bought said "suitable for all cars", but I treat that with a good deal of scepticism. The bill I have just paid for a new brass core for my DS radiator was eye-watering ... I'm taking no chances with that.

 

[JumbleDuck]

I've got to refute this urban legend:

There is NO DIFFERENCE between EG and PG in the marine environment, and I challenge anyone to find scholarly work that says otherwise.

I have repeatedly posted references to this, and it's sad that the myth persists. A full engine's worth of 50-50 EG is below LD50 by the time it has diffused less than a meter from point of entry. That's a damned unlucky fish.