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Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Market size 31Growth 39Conversion 61Competition 24Returns 94Price range 4Avg price 49Brand share 0Review moat 51Quality gap 18

Returns

Great1.1%

return rate — above 6% kills the launch gate

Conversion

Good5.3%

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

Review moat

Good1,447.71

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay$11.85

avg listing price — sweet spot $15–$100

Growth

Okay+11.4%

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

Market size

Okay$140K

$140K/yr · 223K searches

Competition

Bad71%

top-5 click share — a locked-up shelf

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Price range

Bad$9.14–$15.24

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

Brand share

Bad100%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.

Brands

5 flat

Sellers

87

Top-5 brand share

100%

Open market

0%

  • Wix66%
  • Mopar20%
  • Chrysler6%
  • Newparts6%
  • K&N2%

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$14K20%$28K30%$42K40%$56K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 14 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +11.4% search growth over the last 90 days.
5K3KSpike '24Prime Day '25Spike '25SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.3×

Reviews

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

What buyers love

Filtration41%

“Great filter for the money”

Quality-Overall16%

“Excellent Product”

Size-Overall12%

“Fit nice”

Value For Money10%

“good value”

Advertised Vs Actual Product5%

“As advertised”

Assembly/Installation2%

“Easy Install”

Lubrication1%

“They sell great oil”

Efficiency1%

“Works well”

Locally Manufactured1%

“Decent U. S. A. Made filter just as expected not Korean made like the other K”

Pressure1%

“The oil pressure looks normal”

What buyers complain about

Filtration25%

“The filter is shorter than the one I removed”

Quality-Overall12%

“Bad quality control”

Size-Overall11%

“Does NOT fit”

Leak-Proof8%

“it started leaking oil”

Compatibility-Overall4%

“Not fit car”

Product Condition4%

“This is a brand new item”

Paint Quality3%

“In short, flaking paint can be seen on the body of the filter inside the gasket which seems like it could easily flake further and get into my oil”

Rusts/Corrodes3%

“Rust inside new filter”

Advertised Vs Actual Product3%

“Did not fit car like website stated it would”

Metal Quality3%

“I blew out the metal shavings”

Top return reasons

Size-Overall37%
Filtration25%
Compatibility-Overall12%
Product Condition5%
Value For Money3%
Advertised Vs Actual Product3%
Defective Material/Parts3%
Paint Quality2%
Leak-Proof2%
Rusts/Corrodes1%