VP STAY FROSTY Coolant

[Davejam]

No overheating issue here — temps stay steady at 93°C (199°F). The problem is that after a year the mix creeps up to ~60% glycol, likely from water loss in our extreme heat. That’s why I’m leaning toward glycol-free VP Stay Frosty with yearly changes for better heat transfer.

Then just top off with distilled water every few months.

 

[Yukiwari]

Those temperatures are totally acceptable...most cars run that hot by design.

I don't think you need freeze protection in your climate, so run a 70/30 mix (Water/coolant).
Water is a better heat transfer fluid than glycol, but you need the coolant for freezing and anti-corrosion.

If you're determined to use the VP coolant, go for it, it should work fine.
But the claim it reduces temperatures by up the 14F is compared to 50/50.
Compared to 70/30 maybe a degree or 2 if you believe that its somehow actually superior.

Thanks, that’s a really clear and convincing explanation. I appreciate the way you broke it down — especially the point about 70/30 vs. 50/50 and the realistic comparison to VP Stay Frosty. Very helpful!

 

[Yukiwari]

If you’re losing water with a coolant mixture, then you will lose water no matter which mixture you’re using. You’ll have to add water either way so I don’t see what the advantage is.

Exactly, with a regular 50/50 mix, if lose water in 50/50 mixture just top it up with distilled water, and that keeps the mixture at 50/50 without increasing the glycol concentration over time.

usually lost about 50–100 ml per month (roughly 1/4 quart)

 

[BrendanC]

Exactly, with a regular 50/50 mix, if lose water in 50/50 mixture just top it up with distilled water, and that keeps the mixture at 50/50 without increasing the glycol concentration over time.

usually lost about 50–100 ml per month (roughly 1/4 quart)

does your car not have a sealed overflow system?

 

[Yukiwari]

does your car not have a sealed overflow system?

My overflow tank has a vent, just like the small hole at the top under the cap, designed that way by Hyundai

 

[BrendanC]

My overflow tank has a vent, just like the small hole at the top under the cap, designed that way by Hyundai

that makes sense. i’m a large fan of how GM has done it on their full size trucks/SUV’s. pressurized overflow/degas bottles.

just keep your coolant topped up with distilled water and as long as you don’t have any physical leaks you should be able to maintain a nice 30/70 (coolant/water) mixture.

 

[97prizm]

Hello everyone,

I’m considering using VP STAY FROSTY radiator water in a regular car, specifically my Hyundai Elantra MD. I live in a hot subtropical climate, with summer temperatures reaching around 48°C (118°F) and winter temperatures between 5–8°C (41–46°F), so freezing isn’t a concern.

I have a few questions:

1. Does it actually help reduce temperatures at the engine head?
2. Is it suitable for regular cars like mine?
3. What is the recommended replacement interval—one year or less?

Thanks in advance for any insights!

I know that I'll get flak but project farm I think had a test a while back. I know that one of the automotive magazine ran a test years ago. Maybe check out a Mercedes Benz Forum.

 

[thastinger]

Hello everyone,

I’m considering using VP STAY FROSTY radiator water in a regular car, specifically my Hyundai Elantra MD. I live in a hot subtropical climate, with summer temperatures reaching around 48°C (118°F) and winter temperatures between 5–8°C (41–46°F), so freezing isn’t a concern.

I have a few questions:

1. Does it actually help reduce temperatures at the engine head?
2. Is it suitable for regular cars like mine?
3. What is the recommended replacement interval—one year or less?

Thanks in advance for any insights!

I don't think you have a problem to solve. I've been to where you are and I've taken the "desert racing" tour where I rode in seemingly stock Nissan VK56 equipped vehicles that were bouncing off the rev limiter for a straight hour playing around in the sand dunes...in the summer there. AC blasting and no overheating issues.

If it helps you sleep at night you could do a 70 water 30 mix, or even an 80/20. I don't know how true it is but I've read, in places, that 10-15% coolant will be a satisfactory corrosion inhibitor....but I would stick to 70/30.

 

[kschachn]

If it helps you sleep at night you could do a 70 water 30 mix, or even an 80/20. I don't know how true it is but I've read, in places, that 10-15% coolant will be a satisfactory corrosion inhibitor....but I would stick to 70/30.

The minimum recommended concentration should be listed somewhere, either in the owner's manual or on the coolant container.

 

[Yukiwari]

that makes sense. i’m a large fan of how GM has done it on their full size trucks/SUV’s. pressurized overflow/degas bottles.

just keep your coolant topped up with distilled water and as long as you don’t have any physical leaks you should be able to maintain a nice 30/70 (coolant/water) mixture.

Excellent, I’ll do that instead of switching to VP in this case. I’ll just keep topping up with distilled water and maintain the 30/70 coolant/water mix.

 

[Yukiwari]

I don't think you have a problem to solve. I've been to where you are and I've taken the "desert racing" tour where I rode in seemingly stock Nissan VK56 equipped vehicles that were bouncing off the rev limiter for a straight hour playing around in the sand dunes...in the summer there. AC blasting and no overheating issues.

If it helps you sleep at night you could do a 70 water 30 mix, or even an 80/20. I don't know how true it is but I've read, in places, that 10-15% coolant will be a satisfactory corrosion inhibitor....but I would stick to 70/30.

ill top up with distilled water as needed to avoid increasing glycol concentration over time. Seems like plenty for my hot climate

 

[Yukiwari]

The minimum recommended concentration should be listed somewhere, either in the owner's manual or on the coolant container.

Hyundai Recommends 65/35 is max to get and 50/50 low but i think this for korean climate in my climate water should be 70 at least

 

[thastinger]

ill top up with distilled water as needed to avoid increasing glycol concentration over time. Seems like plenty for my hot climate

Your regular tap was there is either distilled or RO huh?