Is starting fluid profitable to sell on Amazon United States?

The niche generates $710K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +3.1%. Flapen's verdict: Skip it (48/100).

How competitive is the starting fluid niche?

6 brands and 68 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 97% of demand.

What do buyers complain about in starting fluid?

Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Ease Of Cleaning. The return rate is 0.2%.

When does demand for starting fluid peak?

Demand peaks in Apr–May; the busiest month runs 1.6× the quietest.

What does it cost to enter the starting fluid niche?

Listings span $5.28–$41.04; the average listing price is $19.34 (sweet spot $15–$100). The average incumbent carries 2,162 reviews — the moat a new listing must climb.

starting fluid

Skip it

Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.2%

return rate — above 5% kills the launch gate

Conversion

Incredible12.8%

search→purchase rate — share of searches ending in a sale

Avg price

Great$19.34

avg listing price — sweet spot $15–$100

Price range

Good$5.28–$41.04

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Good$710K

$710K/yr · 286K searches

Review moat

Okay2,161.67

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+3.1%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad86%

top-5 click share — a locked-up shelf

Brand share

Bad97%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, starting fluid is a $710K/yr Amazon United States market (286K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Apr–May. Verdict: Skip it — 48/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

starting fluid market data

Units sold / yr: 50K–60K; avg 5,000–6,000/product
Revenue / yr: $967K–$1.2M; units × avg price
Conversion rate: 12.8%
Avg BSR: #38
Page quality: 0%
Prime: 100%
Sponsored: 89%
Out of stock: 2.1%
Avg brand age: 104 months
Avg seller age: 153 days

Competition & brand share

The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 rising

Sellers

Top-5 brand share

97%

Top 20: 100%

Top-5 click share

86%

Top 20: 100%

Open market

STA-BIL59%
Valvoline15%
Gumout9%
Johnsen's8%
Lucas Oil6%
MPD3%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +3.1% search growth over the last 90 days.

Peak months: Apr, May · busiest ÷ quietest = 1.6×

Open Trend

Top starting fluid search terms

starting fluid119K/yr +4.1%14.0% conv.
starter fluid73K/yr +19.3%14.7% conv.
starting fluid spray49K/yr +4.3%13.8% conv.
starter fluid spray19K/yr -27.0%14.6% conv.
lawn mower starter fluid2K/yr +140.3%13.1% conv.
engine starter fluid spray6K/yr -36.8%16.1% conv.
ether starting fluid4K/yr -13.5%9.5% conv.
engine starting fluid3K/yr +3.6%13.7% conv.
starting fluid case 12 pack3K/yr -51.1%12.1% conv.
starting fluid spray can3K/yr -49.0%17.9% conv.

All search terms

Top starting fluid 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 9 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

STA-BIL Starting Fluid - Prolongs Starter Life - Upper Cylinder Lube - for Gasoline and Diesel Engines - Guaranteed Faster Starts Down to -65F 11 oz (22004)

STA-BIL$5.284.7★3,607 rev

Valvoline Starting Fluid with Upper Cylinder Lubricant Fast Engine Start Formula Effective in Extreme Cold and Humid Conditions Reduces Wear 11oz

Valvoline$13.264.8★78 rev

Gumout 5072866 Starting Fluid - 11 oz.

Gumout$5.684.8★4,034 rev

Lucas Oil 11238 Sure Start Premium Starting Fluid - 10.7 Ounce

Lucas Oil$8.344.7★299 rev

STA-BIL Starting Fluid - Prolongs Starter Life - Upper Cylinder Lube - for Gasoline and Diesel Engines - Guaranteed Faster Starts Down to -65F (22004) 11 Fl Oz (Pack of 6) - Packaging May Vary

STA-BIL$30.114.7★3,607 rev

Newest

by launch date

MPD Pro Starter Starting Fluid Spray Premium 50% Ether Formula for Fast Cold Starts Works to -65F Gas & Diesel Engines Upper Cylinder Lubrication 10.7 oz (1-Pack)

MPD$20.184 rev

5mo ago

Lucas Oil 11238 Sure Start Premium Starting Fluid - 10.7 Ounce

Lucas Oil$8.34299 rev

4y ago

STA-BIL Fast Fix Small Engine Treatment 8 oz Treats 20 Gallons Fixes Rough Running Engines Carburetor & Fuel Injector Cleaner Removes Water For Lawn Mowers & Small Engines

STA-BIL$9.596,737 rev

6y ago

STA-BIL Starting Fluid - Prolongs Starter Life - Upper Cylinder Lube - for Gasoline and Diesel Engines - Guaranteed Faster Starts Down to -65F (22004) 11 Fl Oz (Pack of 6) - Packaging May Vary

STA-BIL$30.113,607 rev

6y ago

STA-BIL Starting Fluid - Prolongs Starter Life - Upper Cylinder Lube - for Gasoline and Diesel Engines - Guaranteed Faster Starts Down to -65F 11 oz (22004)

STA-BIL$5.283,607 rev

11y ago

What buyers say about starting fluid

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall22%

“Excellent Product as advertised”

Efficiency20%

“works like advertised”

Advertised Vs Actual Product12%

“Works As intended”

Value For Money12%

“Definitely worth the money”

Lubrication6%

“I like that it includes an upper cylinder lubricant”

Ease Of Cleaning5%

“Cleaned out my lawnmower engine within minutes”

Fuel Efficiency3%

“This stuff actually works put in proper amount with fresh gas”

Ease Of Use3%

“It is easy to use”

Strength2%

“more powerful than ever”

Functionality-Overall2%

“HIS STUFF WORKS GREAT”

What buyers complain about

Functionality-Overall41%

“Didnt quite work for my case”

Quality-Overall9%

“Garbage”

Ease Of Cleaning5%

“I personally don't use this for cleaning”

Maintenance And Repair4%

“Didnt fix anything waste of money not happy”

Motor Issues4%

“the motor slowly went from lousy to purring. after about 10 restarts from the get-go”

Ease Of Use4%

“anyway, it was running really rough with it being hard to start”

Leak-Proof3%

“Cap doesn't prevent it from leaking”

Adhesion/Stickiness2%

“it makes a sticky mess”

Fuel Efficiency2%

“troubleshooting fuel delivery problems”

Strength2%

“Weak starter”

Top return reasons

Functionality-Overall22%

Leak-Proof20%

Compatibility-Overall15%

Fuel Efficiency8%

Motor Issues8%

Value For Money6%

Size-Overall6%

Advertised Vs Actual Product5%

Defective Material/Parts3%

Maintenance And Repair1%

Common questions

Is starting fluid profitable to sell on Amazon United States?: The niche generates $710K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +3.1%. Flapen's verdict: Skip it (48/100).
How competitive is the starting fluid niche?: 6 brands and 68 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 97% of demand.
What do buyers complain about in starting fluid?: Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Ease Of Cleaning. The return rate is 0.2%.
When does demand for starting fluid peak?: Demand peaks in Apr–May; the busiest month runs 1.6× the quietest.
What does it cost to enter the starting fluid niche?: Listings span $5.28–$41.04; the average listing price is $19.34 (sweet spot $15–$100). The average incumbent carries 2,162 reviews — the moat a new listing must climb.