If you use it, the cooling system has to be completely devoid of water. Or words to that effect on the label.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Here's what Jay Leno (a true car guy) has to say about the stuff:

https://www.youtube.com/watch?v=t7PykrgzWPQ

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Lillee - 1969 Morris Mini K

Just watched the Jay Leno link. They quoted that it can tolerate 3% water left in the system. So the heater would need a good drain.

I have never had problems with well maintained water/coolant cooling systems and I don't really know why you would want to re-invent the wheel with a 40 plus year old cast iron motor. As the saying goes "if it ain't broke don't fix it"

some glycol based coolants will eat away at parts if run neat.
cant remember what ones though.

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It's easy once you know how.

One of my old motorbikes needed to run on glycol free coolant as it ate at the ceramic seals.

/shrug

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You're so square
Baby I don't care

there is also a class of non glycol coolants that used to be specified for racetrack applications..... spillages etc didn't create a slippery part of the track, such as Penrite 10 10th Race Coolant http://www.penriteoil.com.au/products.php?id_categ=7&id_products=482 .. this doesn't seem to be required or enforced any more...? don't know of their effectiveness/efficiency

Old neighbour stuffed their welsh plugs in a commodore they used to fill it with coolant they put in coaches. He was a bus driver.

I'm not very good at catching my coolant, and its too expensive to let dribble down the driveway!

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

every time I've tried buying 10 10ths everyone denies it's existence.
Now there is penrite sin, not sure if it's the same

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You're so square
Baby I don't care

I tried it in my old VW beetle, it leaked out.

penrite sin is the same as 10 10th,

Forgive the noob question but do Minis/ older cars require different coolant to newer cars.. I have 5lts left over from my commodore can u use that in my mini ??

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64' 850 1275cc

Yes you can use it but I never mix coolants. If you don't know what is in your mini / how long its been in there flush the entire system and fill with the left over coolant from your crummydore.

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"In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.