505 cro engine cleaner
Skip itStrong incumbent ratings (4.7★) — this niche doesn't clear our bar today.
Returns
Incredible0.7%return rate — above 5% kills the launch gate
Avg price
Incredible$25.41avg listing price — sweet spot $15–$100
Price range
Great$6.47–$87.87cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good4.8%search→purchase rate — share of searches ending in a sale
Market size
Good$348K$348K/yr · 285K searches
Growth
Okay+0.1%90-day search growth — must beat 0% to launch
Brand share
Bad90%top-5 brand share — brand-locked demand
Review moat
Bad4,672.88avg incumbent reviews — the moat a new listing must climb
Competition
Bad72%top-5 click share — a locked-up shelf
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 505 cro engine cleaner is a $348K/yr Amazon United States market (285K searches/yr). The top 5 brands hold 90% of demand. Verdict: Skip it — 45/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
505 cro engine cleaner market data
- Units sold / yr
- 15K–20K
- avg 1,250–1,500/product
- Revenue / yr
- $381K–$508K
- units × avg price
- Conversion rate
- 4.8%
- Avg BSR
- #182
- Page quality
- 0%
- Prime
- 94%
- Sponsored
- 71%
- Out of stock
- 1.4%
- Avg brand age
- 93 months
- Avg seller age
- 139 days
Competition & brand share
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.Brands
10 rising
Sellers
88
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
72%
Top 20: 100%
Open market
7%
- Liqui Moly56%
- Triax14%
- MAATSEN13%
- Gunk4%
- Motul3%
- XADO3%
- Open — no brand owns it (4 brands, 7%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +0.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Top 505 cro engine cleaner search terms
- engine flush83K/yr
- liqui moly engine flush60K/yr
- motor flush19K/yr
- engine flush liqui moly14K/yr
- liquid molly engine flush13K/yr
- engine oil flush14K/yr
- liquid moly engine flush12K/yr
- engine oil cleaner9K/yr
- oil flush7K/yr
- amsoil engine flush7K/yr
Top 505 cro engine cleaner products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 17 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Liqui Moly Engine Flush Plus 300ml
Liqui Moly$17.704.7★6,447 rev
TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon | Non-Solvent | Safe for Engine Seals Injectors | Professional Shop Grade (16 oz - 473 ml)
Triax$13.654.8★234 rev
Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush
Liqui Moly$21.554.7★14,165 rev
Liquii Moly Pro-Line Engine Flush (500 ML) - 2 PACK
MAATSEN$39.114.7★136 rev
Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037
Liqui Moly$19.994.7★9,710 rev
Newest
by launch dateTRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon | Non-Solvent | Safe for Engine Seals Injectors | Professional Shop Grade (16 oz - 473 ml)
Triax$13.65234 rev
Liquii Moly Pro-Line Engine Flush (500 ML) - 3 PACK
Generic$51.0357 rev
Liquii Moly Engine Flush (300 ML) - 2 PACK
MAATSEN$35.2612 rev
Liquii Moly Pro-Line Engine Flush (500 ML) - 2 PACK
MAATSEN$39.11136 rev
BlueDevil Products Motor Flush - 1 Quart
BlueDevil Products$10.39128 rev
Trending
90-day click momentumLiquii Moly Engine Flush (300 ML) - 2 PACK
MAATSEN$35.264.2★
Berryman 1216 Oil Change Flush 16-Ounce
Berryman$14.534.7★
Liqui Moly motorspulung 500ML (2427) PRO LINE Engine Flush
Liqui Moly$21.554.7★
Liquii Moly Pro-Line Engine Flush (500 ML) - 2 PACK
MAATSEN$39.114.7★
Motul Engine Clean | Oil Additive & Flush for Gasoline & Diesel Engines | Helps Remove Sludge & Improve Oil Flow | Supports Emission System Care & Engine Protection | 300ml
Motul$18.404.7★
What buyers say about 505 cro engine cleaner
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Good Value”
“Better gas mileage”
“Works as intended”
“Filled with Fresh oil and filter, and I also used some ProLube oil treatment, and have amazing oil pressure and have no issues anymore”
“quieter”
“Product as advertised”
“Clean and keep going”
“Easy to use”
“Keep that motor running”
What buyers complain about
“It was very noisy lifter wise”
“Made my oil look like mud when i went to replace it”
“A little expensive”
“This does not work at all”
“Did not work on my VW Tiguan”
“Leaking”
“I gained more compression on cylinders that were lacking compression”
“It makes the oil look dirty”
“Bottled junk”
“expected gas milage increase”
Top return reasons
Common questions
- Is 505 cro engine cleaner profitable to sell on Amazon United States?
- The niche generates $348K/yr across 17 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +0.1%. Flapen's verdict: Skip it (45/100).
- How competitive is the 505 cro engine cleaner niche?
- 10 brands and 88 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in 505 cro engine cleaner?
- Top complaints mined from reviews: Noise Level, Lubrication, Value For Money. The return rate is 0.7%.
- When does demand for 505 cro engine cleaner peak?
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- What does it cost to enter the 505 cro engine cleaner niche?
- Listings span $6.47–$87.87; the average listing price is $25.41 (sweet spot $15–$100). The average incumbent carries 4,673 reviews — the moat a new listing must climb.