引用:
下面引用由金毛毛E46M3在 2009/04/01 04:03am 發表的內容：
原來redline還有出這個@@" 列入保養名單 感謝大大分享 =)
boxy大大:
所以是用 15/85 + 2 罐Water Wetter
15是水箱精? 85是水? 還是有 15/85這種的市售水箱水??
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We are talking about two relative but different subjects here~
The sole purpose of water wetter is to soften the surface tension of coolant - water - so as to enable water penetrating air bubble layer attached to hot (exceeding boiling temp under pressure) metal surface and improve thermo transfer capacity over fixed time, by significantly increasing the contact area.
As learnt from high school physics, H2O is the best liquid as for thermo capacity, period. Adding different solutions, such as anti freeze WILL reduce the overall thermo capacity. However pure water does not help to reduce rust and lubricate critical moving parts, such as aluminum radiator or the moving water pump in your bimmer, Anti freeze is added to provide these critical functions on street cars, and of course, to anti freeze under freezing temp~
In Taiwan consider the coolant would almost never freeze, one may use even pure distilled water all year round (change them frequently to reduce rust deposit) and enjoy better cooling efficiency than anti-freeze/water mix.
Now, as for mixture of af/water, most of the antifreeze sold are pre-mixed in 20/80 or 50/50. The ratio we are talking about is between pure concentrated anti-freeze and pure water.
Hope above helps~