fuel injector cleaner
Skip itA concentrated shelf (top 5 take 91% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.6%return rate — above 5% kills the launch gate
Conversion
Great10.2%search→purchase rate — share of searches ending in a sale
Avg price
Good£11.95avg listing price — sweet spot $15–$100
Price range
Okay£5.11–£20.85cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Bad£98K£98K/yr · 80K searches
Review moat
Bad6,896.38avg incumbent reviews — the moat a new listing must climb
Growth
Bad-11.1%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Brand share
Bad97%top-5 brand share — brand-locked demand
Competition
Bad91%top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, fuel injector cleaner is a £98K/yr Amazon United Kingdom market (80K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 34/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
fuel injector cleaner market data
- Units sold / yr
- 8K–10K
- avg 750–1,000/product
- Revenue / yr
- £96K–£120K
- units × avg price
- Conversion rate
- 10.2%
- Avg BSR
- #113
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 87 months
- Avg seller age
- 195 days
Competition & brand share
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 falling
Sellers
44
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
91%
Top 20: 100%
Open market
0%
- Liqui Moly56%
- WYNNS19%
- STP15%
- TRIAX4%
- Wynn's3%
- Carlube3%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -11.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top fuel injector cleaner search terms
- engine flush37K/yr
- engine flush diesel12K/yr
- liqui moly engine flush11K/yr
- engine flush petrol5K/yr
- engine oil flush6K/yr
- diesel engine flush3K/yr
- oil flush3K/yr
- liquid moly engine flush3K/yr
Top fuel injector 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 8 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
LIQUI MOLY Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2427
Liqui Moly£8.444.7★14,367 rev
Wynns Engine Oil Flush Cleans Inside Engine & Removes Harmful Deposits 425ml
WYNNS£5.214.7★1,173 rev
STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml
STP£5.114.6★2,047 rev
LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678
Liqui Moly£7.054.7★2,313 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 473 ml / 16 US Oz
TRIAX£16.834.9★227 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 473 ml / 16 US Oz
TRIAX£16.83227 rev
Wynns Commercial Vehicle Oil System Flush - Deep Engine Cleaner - Removes Sludge & Deposits - Turbo Safe - For All Engine Types - Synthetic & Mineral Oil Compatible - 1L
Wynn's£15.349 rev
LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678
Liqui Moly£7.052,313 rev
Carlube Flushing Oil SAE 20 4.55 L
Carlube£20.8599 rev
STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml
STP£5.112,047 rev
Trending
90-day click momentumTRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon - Non-Solvent - Safe for Engine Seals & Injectors - Professional Shop Grade 473 ml / 16 US Oz
TRIAX£16.834.9★
Wynns Commercial Vehicle Oil System Flush - Deep Engine Cleaner - Removes Sludge & Deposits - Turbo Safe - For All Engine Types - Synthetic & Mineral Oil Compatible - 1L
Wynn's£15.344.8★
Wynns Engine Oil Flush Cleans Inside Engine & Removes Harmful Deposits 425ml
WYNNS£5.214.7★
STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml
STP£5.114.6★
LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678
Liqui Moly£7.054.7★
What buyers say about fuel injector cleaner
What buyers praise and complain about, mined from review topics.What buyers love
“The product is great as have used before”
“Effective”
“Does the job as expected”
“Amazing stuff flushed my oil out no problem”
“Great value engine flush”
“Does make the engine smoother and quieter, and its easy to use”
“Great value engine flush”
“Clean engine”
“Easy to use”
“it definitely feels smoother”
What buyers complain about
“have heard stories about leaks caused afterwards”
“a little pricey”
“not strong enough for a heavily varnished engine”
“The old oil was pretty black even though it was within service limits”
Top return reasons
Common questions
- Is fuel injector cleaner profitable to sell on Amazon United Kingdom?
- The niche generates £98K/yr across 8 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -11.1%. Flapen's verdict: Skip it (34/100).
- How competitive is the fuel injector cleaner niche?
- 6 brands and 44 sellers compete. The top 5 products take 91% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in fuel injector cleaner?
- Top complaints mined from reviews: Leak-Proof, Value For Money, Strength. The return rate is 0.6%.
- When does demand for fuel injector cleaner peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the fuel injector cleaner niche?
- Listings span £5.11–£20.85; the average listing price is £11.95 (sweet spot $15–$100). The average incumbent carries 6,896 reviews — the moat a new listing must climb.