--- title: "505 cro engine carbon cleaner — Niche Verdict: Worth a look (60/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/505-cro-engine-carbon-cleaner" last_updated: "2026-07-10T02:43:18.758Z" locale: en meta: description: "505 cro engine carbon cleaner shows low returns (0.0%), but a concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list." "og:description": "505 cro engine carbon cleaner shows low returns (0.0%), but a concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list." "og:title": "505 cro engine carbon cleaner — Niche Verdict: Worth a look (60/100) | Amazon United States - Flapen" --- Back to Flapen home # **505 cro engine carbon cleaner** **Worth a look****60/100 ** 505 cro engine carbon cleaner shows low returns (0.0%), but a concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list. **Market/yr** **$4.5M** **Growth (1y)** **+435.7%** **Products** **3** **Brands** **1** was 5 a year ago **Sellers** **6** **Price range** **$29.38–$111.96** **Returns** **0.0%** **Rating** **4.6★** **Worth a look** Scored 60/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **61** ×0.30 Growth **95** ×0.30 Competition **0** ×0.20 Quality gap **30** ×0.10 Returns **100** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +435.7% year over year. 34K17KSpike '24Black Friday '24Spike '25Prime Day '25Black Friday '25Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND Peak months: Mar, Nov · busiest ÷ quietest = 2.0× ## **Competition** - Prolube100% The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack. 1 brands and 6 sellers compete here. **Brands** **1 **▼falling was 5 a year ago **Sellers** **6** **Top 5 brand share** **100%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1QT)](https://m.media-amazon.com/images/I/41m1ebjLemL.jpg) [**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1QT)**](https://www.amazon.com/dp/B0DW3MFN2F) Prolube$37.004.6★2,79369%▲rising 2 ![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)](https://m.media-amazon.com/images/I/41-yywE-K4L.jpg) [**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)**](https://www.amazon.com/dp/B0DVT5763K) Prolube$29.384.6★2,79322%▼falling 3 ![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1Gallon)](https://m.media-amazon.com/images/I/41fQlTEOpEL.jpg) [**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1Gallon)**](https://www.amazon.com/dp/B0FH22R2KB) Prolube$111.964.6★2,7939%▲rising ## **Product shelf** All 3 tracked products in this niche. Top sellersNewestTrending [![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1QT)](https://m.media-amazon.com/images/I/41m1ebjLemL.jpg)**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1QT)** Prolube**$37.00**4.6★2,793 reviews](https://www.amazon.com/dp/B0DW3MFN2F) [![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)](https://m.media-amazon.com/images/I/41-yywE-K4L.jpg)**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (16oz)** Prolube**$29.38**4.6★2,793 reviews](https://www.amazon.com/dp/B0DVT5763K) [![Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1Gallon)](https://m.media-amazon.com/images/I/41fQlTEOpEL.jpg)**Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear Noise Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1Gallon)** Prolube**$111.96**4.6★2,793 reviews](https://www.amazon.com/dp/B0FH22R2KB) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Quality-Overall**21% *“Best oil additive in existence”* **Noise Level**17% *“My engine is quieter”* **Advertised Vs Actual Product**15% *“AS ADVERTISED”* **Lubrication**13% *“Improved lubricant and performance all around”* **Efficiency**11% *“Immediate improvements”* **Fuel Efficiency**6% *“Our 2013 Tahoe ppv with high mileage still runs great”* **Value For Money**5% *“Great price”* **Motor Power**3% *“Goes in everything I have motor wise”* **Friction**1% *“on a 4-cylinder there's not a lot of friction so I would say 100% confirmed great stuff”* **Ease Of Use**1% *“Easy to use”* ### **What buyers complain about ** **Functionality-Overall**18% *“Don't work as described”* **Noise Level**18% *“the fan was making noise”* **Value For Money**16% *“was much more expensive”* **Lubrication**13% *“Thick oil that doesn't work”* **Leak-Proof**3% *“Caused leaking seals”* **Advertised Vs Actual Product**3% *“Ive got proven records this does not do what it says”* **Fuel Efficiency**3% *“Crap dont buy this product it made my engine tick”* **Friction**2% *“I cant tell as of right now as the friction noises I hear are still there over a month later”* **Quality-Overall**2% *“Complete garbage”* **Motor Issues**2% *“Didn't quite my engine as I was hoping it would”* #### **Top return reasons**- Leak-Proof25% - Compatibility-Overall19% - Functionality-Overall13% - Advertised Vs Actual Product9% - Defective Material/Parts8% - Lubrication5% - Noise Level5% - Certifications3% - Value For Money3% - Size-Overall2%