--- title: "coolant additive — Niche Verdict: Skip it (36/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/coolant-additive" last_updated: "2026-07-09T23:46:55.051Z" locale: en meta: description: "a concentrated shelf (top 5 take 87% of clicks) — coolant additive doesn't clear our bar today." "og:description": "a concentrated shelf (top 5 take 87% of clicks) — coolant additive doesn't clear our bar today." "og:title": "coolant additive — Niche Verdict: Skip it (36/100) | Amazon United States - Flapen" --- Back to Flapen home # **coolant additive** **Skip it****36/100 ** a concentrated shelf (top 5 take 87% of clicks) — coolant additive doesn't clear our bar today. **Market/yr** **$161K** **Growth (1y)** **+110.6%** **Products** **9** **Brands** **4** was 4 a year ago **Sellers** **90** **Price range** **$7.45–$50.55** **Returns** **0.5%** **Rating** **4.6★** **Skip it** Scored 36/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **8** ×0.30 Growth **66** ×0.30 Competition **4** ×0.20 Quality gap **30** ×0.10 Returns **96** ×0.10 ## **Demand** Weekly Amazon search volume, last 83 weeks — +110.6% year over year. 2K1KSpike '25Spike '26Dec '24Mar '25Jun '25Sep '25Dec '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND Peak months: May, Jun, Jul · busiest ÷ quietest = 2.9× ## **Competition** - Red Line75% - Royal Purple14% - Hy-Per Lube7% - Design Engineering5% The top 5 products capture 87% of clicks — a locked-up shelf that new listings rarely crack. 4 brands and 90 sellers compete here. **Brands** **4 **—flat was 4 a year ago **Sellers** **90** **Top 5 brand share** **100%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Red Line 80204 WaterWetter Super Coolant - 12 Ounce](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg) [**Red Line 80204 WaterWetter Super Coolant - 12 Ounce**](https://www.amazon.com/dp/B000CPI5ZK) Red Line$13.604.6★3,22440%▼falling 2 ![Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg) [**Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)**](https://www.amazon.com/dp/B00NQ9STKA) Red Line$28.914.8★53423%▲rising 3 ![Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.](https://m.media-amazon.com/images/I/41VeXvp4KkL.jpg) [**Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.**](https://www.amazon.com/dp/B000BRGAJ2) Royal Purple$13.304.5★1,90414%▲rising 4 ![Red Line 80205 Supercool Extreme Powersports Coolant Fortified with WaterWetter - 1/2 Gallon](https://m.media-amazon.com/images/I/41wiPHT5vnL.jpg) [**Red Line 80205 Supercool Extreme Powersports Coolant Fortified with WaterWetter - 1/2 Gallon**](https://www.amazon.com/dp/B007KPSLU4) Red Line$26.164.7★4046%▼falling 5 ![DEI Radiator Relief Coolant Additive Reduces Engine Temps Up to 30F 16 oz](https://m.media-amazon.com/images/I/41iBerAAPjL.jpg) [**DEI Radiator Relief Coolant Additive Reduces Engine Temps Up to 30F 16 oz**](https://www.amazon.com/dp/B001HYQSE0) Design Engineering$10.464.3★2335%▲rising 6 ![Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz (Pack of 3)](https://m.media-amazon.com/images/I/41SxDwb68AL.jpg) [**Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz (Pack of 3)**](https://www.amazon.com/dp/B07F13298S) Hy-Per Lube$22.524.6★1,1774%▲rising 7 ![Red Line 80204 WaterWetter Super Coolant - 12 Ounce (4 Pack)](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg) [**Red Line 80204 WaterWetter Super Coolant - 12 Ounce (4 Pack)**](https://www.amazon.com/dp/B00COSQMPI) Red Line$50.554.6★904%—flat 8 ![Rislone Hy-per Cool Super Coolant 16 oz.](https://m.media-amazon.com/images/I/41Rs71z7DXL.jpg) [**Rislone Hy-per Cool Super Coolant 16 oz.**](https://www.amazon.com/dp/B001DKSQQQ) Hy-Per Lube$7.454.6★1,1773%▼falling 9 ![Red Line 81215 Supercool Performance Antifreeze/Coolant Ready to Use Formula - 1 Gallon](https://m.media-amazon.com/images/I/41S1I2HcdsL.jpg) [**Red Line 81215 Supercool Performance Antifreeze/Coolant Ready to Use Formula - 1 Gallon**](https://www.amazon.com/dp/B08L9TTV77) Red Line$38.054.7★382%▲rising ## **Product shelf** All 9 tracked products in this niche. Top sellersNewestTrending [![Red Line 80204 WaterWetter Super Coolant - 12 Ounce](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg)**Red Line 80204 WaterWetter Super Coolant - 12 Ounce** Red Line**$13.60**4.6★3,224 reviews](https://www.amazon.com/dp/B000CPI5ZK) [![Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg)**Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)** Red Line**$28.91**4.8★534 reviews](https://www.amazon.com/dp/B00NQ9STKA) [![Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.](https://m.media-amazon.com/images/I/41VeXvp4KkL.jpg)**Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.** Royal Purple**$13.30**4.5★1,904 reviews](https://www.amazon.com/dp/B000BRGAJ2) [![Red Line 80205 Supercool Extreme Powersports Coolant Fortified with WaterWetter - 1/2 Gallon](https://m.media-amazon.com/images/I/41wiPHT5vnL.jpg)**Red Line 80205 Supercool Extreme Powersports Coolant Fortified with WaterWetter - 1/2 Gallon** Red Line**$26.16**4.7★404 reviews](https://www.amazon.com/dp/B007KPSLU4) [![DEI Radiator Relief Coolant Additive Reduces Engine Temps Up to 30F 16 oz](https://m.media-amazon.com/images/I/41iBerAAPjL.jpg)**DEI Radiator Relief Coolant Additive Reduces Engine Temps Up to 30F 16 oz** Design Engineering**$10.46**4.3★233 reviews](https://www.amazon.com/dp/B001HYQSE0) [![Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz (Pack of 3)](https://m.media-amazon.com/images/I/41SxDwb68AL.jpg)**Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz (Pack of 3)** Hy-Per Lube**$22.52**4.6★1,177 reviews](https://www.amazon.com/dp/B07F13298S) [![Red Line 80204 WaterWetter Super Coolant - 12 Ounce (4 Pack)](https://m.media-amazon.com/images/I/31mKrUae+7L.jpg)**Red Line 80204 WaterWetter Super Coolant - 12 Ounce (4 Pack)** Red Line**$50.55**4.6★90 reviews](https://www.amazon.com/dp/B00COSQMPI) [![Rislone Hy-per Cool Super Coolant 16 oz.](https://m.media-amazon.com/images/I/41Rs71z7DXL.jpg)**Rislone Hy-per Cool Super Coolant 16 oz.** Hy-Per Lube**$7.45**4.6★1,177 reviews](https://www.amazon.com/dp/B001DKSQQQ) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Coolant**25% *“Really helps keep coolant temps consistent on a turbo LS”* **Efficiency**20% *“Works well”* **Quality-Overall**14% *“Quality product”* **Value For Money**8% *“Cheaper on Amazon than your local parts store”* **Advertised Vs Actual Product**8% *“Works as advertised”* **Rusts/Corrodes**6% *“Great no rust”* **Heating**4% *“Id definitely buy it again especially in extreme heat”* **Ease Of Use**3% *“Simple to use”* **Functionality-Overall**2% *“Works”* **Color**1% *“matches the Prestone green colored coolent”* ### **What buyers complain about ** **Functionality-Overall**21% *“Did not work”* **Heating**17% *“Coolant temps came down noticeably”* **Value For Money**10% *“Its a bit more expensive than standard options”* **Leak-Proof**8% *“Arrives leaking”* **Lubrication**6% *“Definitely DO NOT want something so slick & greasy in my cooling system on the track, it's just too dangerous for me and other racers”* **Ethical Trade/Fair Trade**4% *“useless scamm”* **Strength**4% *“They don't hold”* **Measurement/Reading Accuracy**4% *“I noticed the temperature gauge actually goes a bit more than half way up when pulling a long hill”* **Color**3% *“at least it changed the color of my antifreeze”* **Coolant**2% *“Dropped my coolant temps by 20° on dyno”* #### **Top return reasons**- Coolant43% - Leak-Proof33% - Functionality-Overall6% - Advertised Vs Actual Product3% - Compatibility-Overall3% - Ease Of Use3% - Value For Money3% - Defective Material/Parts2% - Adhesion/Stickiness2% - Heating1%