Design Engineering Radiator Relief Coolant Additive Diesel Engine Coolant for Cars, Trucks, RVs, Motorcycles & More Radiator Coolant Reduces Engine Temps Up to 30°F 16 oz.
Description
🌟 Keep your engine cool and your ride unstoppable!
- RADIATOR CORE GUARDIAN - Reduces mineral buildup and stabilizes pH to protect vital engine parts.
- UNIVERSAL COMPATIBILITY - Works seamlessly with all antifreeze types and radiator metals—cast iron to aluminum.
- SAFE SIMPLE APPLICATION - Non-toxic formula, just 1 oz per quart—perfect for cars, trucks, RVs, and more.
- ULTIMATE OVERHEAT DEFENSE - Stops overheating and fights corrosion to extend your engine’s lifespan.
- COOLER ENGINES PEAK PERFORMANCE - Slash engine temps by up to 30°F for smoother, more efficient rides.
DEI Radiator Relief Coolant Additive is a powerful, non-toxic formula designed to lower engine temperatures by up to 30°F, prevent overheating, and combat corrosion. Compatible with all radiator materials and antifreeze types, it protects your engine’s core by reducing mineral buildup and stabilizing pH levels. Ideal for cars, trucks, RVs, motorcycles, and more, it ensures longer engine life and enhanced performance with easy, safe application.
Specifications
| Manufacturer | Design Engineering |
| Brand | Design Engineering |
| Model | DEI Radiator Relief Coolant Additive |
| Item Weight | 14.4 ounces |
| Product Dimensions | 10 x 4 x 2 inches |
| Country of Origin | China |
| Item model number | 40204 |
| Is Discontinued By Manufacturer | No |
| Exterior | Painted |
| Manufacturer Part Number | 40204 |
| OEM Part Number | 040204 |
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Reviews
J**T
Works.
Simply put, it works. Before adding this additive to my 05 Pontiac GTO, I'd run around 180 on the highway and steadily climb to 200 in slow traffic. This is with an all aluminum radiator, 160 thermostat, and a 30/70 Zerek G-05/distilled water ratio. After adding the DEI additive, I'm around 175 on the highway. However, I've yet to crest 190 while in slow traffic. It climbs from 175 much slower and cools off much quicker once I get moving again.In my opinion, works much better than Water Wetter which I noticed no difference on.
R**N
This Works!
I have a BMW… It’s about 10 years old and like a lot of other BMWs it has cooling issues… I live in LA and usually the summer time is the only time it’s an issue… Lots of idling because of traffic…It’s been hot lately and so I thought I would give this a try because my mechanic has tried a bunch of things and the temp gauge will sometimes “creep up.” I drove it today and it was in the 80s and zero creeping problem ....for the first time in a while (with it being that warm) iEnough said! (I run straight distilled in the summer and this has anti corrosion additives. Set!!
L**
Worked well
I’ve used on a couple cars and it helped out in summer well…good value good price
G**A
as described
fast delivery. Used as specified. Seems to be working as stated
B**.
Was hoping for better
Didn’t see any noticeable change in engine temp.
M**K
Didn't work!
Dumped this in my Humvee pressurized coolant reservoir and it didn't lower temps at all. It has a hydraulic fan that turns on like clockwork at a specific point in my commute, so even a 5* drop in temp would be noticeable. Zero change after driving for a week. It might be better if I ran just this with distilled water. Also, smells like urine.
E**C
It works!
Texas heat forced me to try this out. I flushed my system and did a 90/10 mix and the results are great. It keeps my truck running cool no matter how hard I push her.
R**G
Extra hot summer
Traveling in Arizona in 115+ heat, I wanted a little extra cooling capability. When parked with engine running for AC, extra capability is great. It kept engine temp at 197 degrees while idling for 45 minutes in 115 degree air temp.
Common Questions
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