Site Information

 Loading... Please wait...
  • Image 1

DEi Radiator Releif Coolant Additive

4 Star Rating

Buy in bulk and save


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.

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.

  • Reduces engine temperature up to 30˚F
  • Includes anti-foaming agent
  • Formulated with a corrosion inhibitor
  • No mixing required; just add to cooling system!
  • Reduces pre-existing scale build-up
  • Safe with all alloys
  • Compatible with water and all types of anti-freeze products
  • 100% Biodegradable, Non-Corrosive and Non-Toxic Additive
  • For use in all water cooled engines


  1. DEI Radiator Relief Works Great!

    Posted by Canaan Manley on

    I put the Radiator Relief in my 240sx with a KA24DE engine and ISIS radiator + cooling fans. The Radiator Relief dropped my cooling temps 21°F and helped the radiator be more efficient. For $10, it's definitely worth it!

Write Review