Will this additive help?

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Feb 19, 2024
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I own a 2020 subaru Impreza which I drive very hard and my coolant temps sometimes reach 230-240, will this stuff help?
Screenshot 2024-07-25 at 2.22.27 AM.webp
 
Its not an additive in that remark. It is a substitute for glycol/premix.
Yes, water conducts heat better then regular premix.
Check Water Wetter by Redline.
Should I switch over to regular water plus water wetter?
 
If you feel like its necessary for your application.
At least empty 50% of the coolant, then add Rislone/Redline + clean/distilled water.
 
IMO people think that it enhances the coolant mix they already have in their cooling system, it doesn't. It is designed to be mixed with water, distilled water IIRC. If you forget to drain it in the winter and add the proper coolant/anti-freeze mix, depending on where you live, look out!!
 
The likelihood of this product cooling the engine better than the antifreeze mixture Subaru recommends are low. Subarus are excellent, but every single boxer engine they make has a vulnerability in the cooling process, expecially in keeping the heads cool. Your solution is to drive in a more restrained fashion, and to keep things stock.
 
I think these products work best when just mixed with water - and not antifreeze - hence how they are used in racing …
Rislone is sold as a coolant additive. I think you should clarify that this is not a recommendation to run Rislone and water in place of coolant for the original poster. It doesn’t really matter what they do “in racing.”
 
They don't really describe what water wetters do accurately. While water by itself is the best coolant, it needs an anti corrosion additive and plain water doesn't adhere to internal surfaces perfectly to carry heat away. I've seen old X ray films made by Caterpillar showing engines running with plain water vs water with their additive. It's amazing. As the pistons moved up and down, the cylinder walls would move slightly, like microscopic amounts and this made the plain water crash into the walls like the ocean on the beach. I've seen engines run this way long term and the thrust side of the liners gets eroded so badly, sometimes it goes through.
Adding any kind of treatment makes the water "stick" to the internal surfaces and not do this, plus it carries away heat more efficiently.
You'd get the same result running less antifreeze.
 
Should I switch over to regular water plus water wetter?
I wouldn't do that because corrosion happens fast with that combo.

I would get a lower temp thermostat and you could go to a 70 water 30 antifreeze mix or an 80/20 mix and put the water wetter in that.
 
Should I switch over to regular water plus water wetter?
No.

That's for racing. One good freeze, and your engine is at risk. Cracked radiator, cracked block, nothing good.

It would help to know where you live, but in general, using products designed for racing is a poor idea on the street.

If you feel that your engine coolant temperature is getting too high, start by cleaning the radiator and condenser, checking the coolant concentration, ensuring that the fans are working, making sure that air dams and other air management going into the radiator are intact.
 
I ran water wetter in an LLY Duramax that ran hot due to poor design and insufficient radiator. I put it in with the 50/50 Dexcool and it did make a noticeable difference. Its supposed to decrease the surface tension between the coolant and the radiator.
Yes it is primarily a surfactant which is also in a formulated coolant. These products do next to nothing except with plain water.
 
Interesting. This stuff claims to lower temperatures by 41 degrees F compared to a 50/50 coolant mix, and also provides no antifreeze protection. Since I am not currently racing, I will not be buying this today.
A lot of weasel wording going on in those claims. Unless your cooling system is out-of-bounds then the thermostat is what controls the temperature. It is literally impossible for the cooling system to run 41 degrees cooler in this situation. A race car running plain water and no thermostat is different.

In the OP's situation if the thermostat is wide open and yet the coolant temperature is too high then he's far better off lowering the coolant concentration down to the manufacturer's minimum and seeing what that accomplishes, if anything. If it doesn't help then there is something wrong with the system.
 
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