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Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.

Market size 34Growth 50Conversion 68Competition 16Returns 96Price range 81Avg price 86Brand share 4Review moat 68Quality gap 37

Returns

Incredible0.9%

return rate — above 6% kills the launch gate

Avg price

Great$19.53

avg listing price — sweet spot $15–$100

Price range

Great$9.86–$38.54

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

Conversion

Good6.1%

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

Review moat

Good783.92

avg incumbent reviews — the moat a new listing must climb

Growth

Good+20.2%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Market size

Okay$163K

$163K/yr · 137K searches

Competition

Bad81%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 falling

Sellers

30

Top-5 brand share

98%

Open market

0%

  • Subaru73%
  • HengShine12%
  • Kefly7%
  • PAGOTORTAUS3%
  • Jaxivo2%
  • Dtomi2%

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%$16K20%$33K30%$49K40%$65K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 12 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +20.2% search growth over the last 90 days.
4K3KSpike '24Prime Day '25Spike '26SepDecMarJunAugNovMarMay

Peak months: May · busiest ÷ quietest = 1.6×

Reviews

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

What buyers love

Filtration26%

“I especially like the black colored filters over the blue ones as they provide better quality”

Size-Overall23%

“Perfect fit as they should”

Advertised Vs Actual Product11%

“As advertised”

Value For Money11%

“great value for this kit”

Quality-Overall9%

“Good quality”

Efficiency3%

“Does the job”

Assembly/Installation2%

“Easy install”

Ease Of Use2%

“Easy to change”

Leak-Proof2%

“does not leak”

Fuel Efficiency2%

“My Subaru loved the oil & filter change”

What buyers complain about

Filtration38%

“cant use oil filter without it”

Advertised Vs Actual Product16%

“Does not come with both items as advertised”

Color9%

“Previous one's were blue”

Quality-Overall7%

“Cheap junk”

Leak-Proof5%

“This filter leaked in our car”

Size-Overall5%

“wrong sized crush washer”

Pressure2%

“don't have the high pressure bypass valve. it is a much weaker internal spring”

Defective Material/Parts2%

“Not correct part listed for the description”

Value For Money2%

“I think these are slightly cheaper at our local. 1.5 hours away”

Thickness2%

“the inside filtration doesn't look as thick”

Top return reasons

Filtration30%
Advertised Vs Actual Product26%
Size-Overall14%
Compatibility-Overall7%
Value For Money7%
Defective Material/Parts6%
Quality-Overall2%
Ethically/Sustainably Sourced2%
Product Condition1%
Functionality-Overall1%