Antifreeze, type and quantity?

[ss2016]

Thinking ahead here since antifreeze is probably cheaper in the summer.
So two questions regarding anti freeze for the raw water side of a VP D6-400
1) After flushing the raw water side of the system with fresh water I can introduce the antifreeze through the strainer. How many litres do I typically need to ensure it has got to all corners of the system?
2) I understand I need a Propylene Glycol type. Is that correct? Does this mean something like Blue Gee non toxic or Starbrite non toxic. Any recommendations?

Thanks.

PS Can I buy concentrate and dilute it with distilled water. I only need it down to about -15C in Cornwall which is much less extreme than the readymix?

 

[Plum]

Thinking ahead here since antifreeze is probably cheaper in the summer.
So two questions regarding anti freeze for the raw water side of a VP D6-400
1) After flushing the raw water side of the system with fresh water I can introduce the antifreeze through the strainer. How many litres do I typically need to ensure it has got to all corners of the system?
2) I understand I need a Propylene Glycol type. Is that correct? Does this mean something like Blue Gee non toxic or Starbrite non toxic. Any recommendations?

Thanks.

PS Can I buy concentrate and dilute it with distilled water. I only need it down to about -15C in Cornwall which is much less extreme than the readymix?

Fresh or raw water cooled? Your coolant has two very important functions. First, it has to remain liquid below, say, minus 15 decrees. Second, it has to contain corrosion inhibitant additives to prevent all the different materials in the waterways from corroding. The first is easy, the second is mostly unknown as engine manufacturers/marinisers do not publish the specification of the additives for the materials they use. My view is that it is too big a financial risk to use a coolant not recommend or sold by the engine manufacturer.

 

[BB1]

Fresh or raw water cooled? Your coolant has two very important functions. First, it has to remain liquid below, say, minus 15 decrees. Second, it has to contain corrosion inhibitant additives to prevent all the different materials in the waterways from corroding. The first is easy, the second is mostly unknown as engine manufacturers/marinisers do not publish the specification of the additives for the materials they use. My view is that it is too big a financial risk to use a coolant not recommend or sold by the engine manufacturer.

The OP is talking about antifreeze for the raw water side in the winter, not coolant.

 

[BB1]

Thinking ahead here since antifreeze is probably cheaper in the summer.
So two questions regarding anti freeze for the raw water side of a VP D6-400
1) After flushing the raw water side of the system with fresh water I can introduce the antifreeze through the strainer. How many litres do I typically need to ensure it has got to all corners of the system?
2) I understand I need a Propylene Glycol type. Is that correct? Does this mean something like Blue Gee non toxic or Starbrite non toxic. Any recommendations?

Thanks.

PS Can I buy concentrate and dilute it with distilled water. I only need it down to about -15C in Cornwall which is much less extreme than the readymix?

We use Starbrite, don't dilute it, ASAP supplies sometimes do good deals, not sure about quantities but I would imagine 25 litres will probably be fine.
Back flush ball valves or insulate them to be sure if the boat stays afloat. Leave open if you lift the boat.

 

[ss2016]

BB1, thanks for your reply. So with the Starbrite non toxic I am on the right track. I will have a look at ASAP because 25 litres becomes quite expensive.