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DEI 040200 Radiator Relief - 16 Oz.

4 out of 5 stars 6 customer reviews
| 3 answered questions

Price: $16.02 & FREE Shipping on orders over $35. Details
Only 20 left in stock (more on the way).
Ships from and sold by Amazon.com.
  • Enter your model number above to make sure this fits.
  • 30 degrees lower operating temperature
  • 50% quicker warm up
  • No mixing required; just add to cooling system
  • Compatible with water and all anti-freeze mixtures; For use in all water cooled engines
  • Safe with all alloys; 100% Biodegradable, Non-Corrosive and Non-Toxic Additive
See more product details
29 new from $7.48
$16.02 & FREE Shipping on orders over $35. Details Only 20 left in stock (more on the way). Ships from and sold by Amazon.com.

Frequently Bought Together

  • DEI 040200 Radiator Relief - 16 Oz.
  • +
  • DEI 040202 Radiator Relief Cooling System Flush - 16 oz.
Total price: $31.29
Buy the selected items together


Product Information

Technical Details

Brand Design Engineering
Model 40200
Item Weight 1 pounds
Product Dimensions 9.4 x 3.8 x 1.6 inches
Item model number 40200
Manufacturer Part Number 040200
OEM Part Number 040200

Additional Information

ASIN B001HYQSE0
Customer Reviews
4 out of 5 stars 6 customer reviews

4 out of 5 stars
Best Sellers Rank #370,220 in Automotive (See top 100)
#16 in Automotive > Oils & Fluids > Flushes > Radiator
Shipping Weight 1.2 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 6, 2007

Warranty & Support

Warranty, Parts:Parts

Product Description

NEW Radiator Relief supercharges your radiator by transferring heat more efficiently through the radiator. Similar to the original formula this proven coolant additive will reduce your operating temperature up to 30°F reducing engine wear that occurs during extreme use. NEW Radiator Relief is also formulated with a corrosion inhibitor that reduces mineral deposits. This is the first additive that maintains pH levels that otherwise fluctuate over time resulting in core damage.

Customer Reviews

Top Customer Reviews

By JayGoat on October 6, 2014
Verified Purchase
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.
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Verified Purchase
Great product, it really reduces the engine temperdure.
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By Mr. Mike on September 26, 2014
Verified Purchase
Nice stuff..
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DEI 040200 Radiator Relief - 16 Oz.
This item: DEI 040200 Radiator Relief - 16 Oz.
Price: $16.02
Ships from and sold by Amazon.com