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The Pub For General Automotive Related Talk |
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#1 | ||
FF.Com.Au Hardcore
Join Date: Jun 2017
Posts: 1,341
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What % coolant to demineralised water have people had the best results with?
I have a 2001 302 Windsor which got a new radiator & hoses around a year ago. There are no temperature issues but I would like to flush the cooling system before the Sydney summer. |
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#3 | ||
FF.Com.Au Hardcore
Join Date: Jun 2010
Location: Perth
Posts: 1,315
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Hi,
Wouldn't this depend very much on the quality of the coolant, and if it's a 'concentrate' or not? I would get the best possible coolant at a reasonable price (some are marked with '5 year', some are marked with 350.000km guarantee), and I would follow strictly the mixing ratio described on the bottle. Cheers, |
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#4 | ||
FF.Com.Au Hardcore
Join Date: Mar 2005
Posts: 5,252
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Nulon now make a very LOOOOONG lasting Coolant called.......... ONE.
Its in all Auto shops. The idea is that it only ever gets filled/fitted ..........ONCE and supposed to last FOREVER!!!!! I run Nulon Semi Synth 15W40 in my BFWGN too!!! Will fit Nulon ONE next year i think??? |
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#5 | ||
Moderator
![]() Join Date: Jan 2014
Location: Melbourne
Posts: 7,940
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The higher the coolant antifreeze ratio... The less cooling efficiency you get.
The specific heat of antifreeze is less than that of water. This means that for a given temperature change, the antifreeze will carry less heat each time it circulates from engine to radiator and back. So a 50% / 50% ratio of coolant concentrate to water provides good corrosion protection but less cooling effectiveness. A 33% ratio of coolant concentrate to 67% water, will give better cooling efficiency in Australian climate conditions and good corrosion protection. |
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#6 | ||
Former BTIKD
![]() Join Date: Mar 2005
Location: Sunny Downtown Wagga Wagga. NSW.
Posts: 53,197
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One of the few Penrite coolants recommended for my (non Ford) car is the Penrite 7 Year 450,000KM Green Concentrate.
But says it should be used at a concentration level of 50%
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#7 | ||
FF.Com.Au Hardcore
Join Date: Jun 2017
Posts: 1,341
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Thanks for all the advice. I have used Penrite for everything else so may as well continue the trend with the Penrite green. Interesting comment on the 50% mix though and as GasOlane says, that's what Penrite recommend. Is their mixture somehow more effective at that ratio? I remember when I changed he radiator & hoses that X amount of water stays in their so do a flush after a few kays.
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#8 | ||
Regular Member
Join Date: Oct 2010
Location: Perth
Posts: 391
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I'd go by what it says on the packet, and also:
- Choose the longest lasting coolant available - I think for example Nulon make a ten year or 1 million km coolant now? - Make sure the manufacturer says its suitable for your car - Flush the radiator properly with tap and then distilled water - Mix it with distilled water in the highest ratio of coolant to water recommended on the pack - unless you have overheating problems more corrosion protection would be better than less - Change it out at about 2/3 of the interval recommended by the coolant manufacturer. Given a coolant change is only going to cost about $100 and a few hours of your time, if it saves you a single radiator, heater core, transmission heat exchanger, or welch plug its paid for itself many times over :-) |
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#9 | ||
FF.Com.Au Hardcore
Join Date: Feb 2006
Posts: 713
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And check for residual current of course ,
I have 0.15 volts in the ED I6 radiator water with the engine on and with 2 small bottles of Natrad conditioner with tap water, changed every year Modern cars look like they have no residual current , It must be the very good non conductive coolants these days ,??????
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