Is rear main seal stop leak profitable to sell on Amazon United States?

The niche generates $69K/yr across 9 tracked products. 90-day search growth is -8.3%. Flapen's verdict: Skip it (40/100).

How competitive is the rear main seal stop leak niche?

6 brands and 89 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 98% of demand.

What do buyers complain about in rear main seal stop leak?

Top complaints mined from reviews: Leak-Proof, Functionality-Overall, Value For Money. The return rate is 0.6%.

When does demand for rear main seal stop leak peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the rear main seal stop leak niche?

Listings span $9.55–$198.26; the average listing price is $37.88 (sweet spot $15–$100). The average incumbent carries 5,039 reviews — the moat a new listing must climb.

rear main seal stop leak

Skip it

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

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Avg price

Incredible$37.88

avg listing price — sweet spot $15–$100

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good5.5%

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

Price range

Okay$9.55–$198.26

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

Review moat

Bad5,038.78

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-8.3%

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

Market size

Bad$69K

$69K/yr · 33K searches

Competition

Bad83%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, rear main seal stop leak is a $69K/yr Amazon United States market (33K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 40/100.

Data updated Jul 8, 2026 · scored weekly · How we score niches

rear main seal stop leak market data

Units sold / yr: 3K–4K; avg 250–500/product
Revenue / yr: $114K–$152K; units × avg price
Conversion rate: 5.5%
Avg BSR: #768
Page quality: 0%
Prime: 89%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 104 months
Avg seller age: 156 days

Competition & brand share

The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 rising

Sellers

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

83%

Top 20: 100%

Open market

BlueDevil Products42%
Bar's Leaks31%
atp automotive12%
XADO8%
Lucas Oil5%
Liqui Moly2%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -8.3% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top rear main seal stop leak search terms

rear main seal stop leak22K/yr -14.9%7.4% conv.
blue devil rear main sealer11K/yr +4.9%5.0% conv.
rear main seal stop leak additive145/yr +31.3%7.1% conv.
blue devil rear main seal leak stop14/yr -66.7%0.0% conv.

All search terms

Top rear main seal stop leak 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

Bars Leaks Rear Main Seal Repair 16.9 oz

Bar's Leaks$9.554.2★3,146 rev

BlueDevil Products 00234 Rear Main Sealer - 8 Ounce

BlueDevil Products$15.104.1★3,553 rev

ATP Automotive AT-205 Re-Seal Stops Leaks 8 Ounce Bottle 1-Pack

atp automotive$21.014.5★21,809 rev

BlueDevil Products 49499 Oil Stop Leak - 8 Ounce

BlueDevil Products$18.924.1★3,440 rev

BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)

BlueDevil Products$198.264.1★3,553 rev

Newest

by launch date

BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)

BlueDevil Products$198.263,553 rev

1y ago

Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

Lucas Oil$12.041,346 rev

9y ago

XADO ATOMEX Oil Additive Stop Leak Engine - Restore Seal and Gaskets Treatment for Car Engine High Mileage or Rear Main Seal Best Stopper Leaks Reseal (Bottle 250 ml)

XADO$21.93368 rev

12y ago

BlueDevil Products Hydraulic Stop Leak 32 oz | Restores Seals & Stops Leaks in Hydraulic Systems | Safe for Pumps Cylinders & Valves

BlueDevil Products$23.88622 rev

13y ago

LM 1005 Oil Leak Stop 300 ml

Liqui Moly$20.197,512 rev

13y ago

What buyers say about rear main seal stop leak

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

What buyers love

Leak-Proof41%

“Stops leaks”

Quality-Overall13%

“Its a reliable solution that truly delivered on its promises”

Efficiency8%

“It works great”

Value For Money6%

“Good price”

Advertised Vs Actual Product4%

“Works as advertised”

Lubrication4%

“works great for low oil consumption cars such as Volkswagen in Pacific Northwest during the winter”

Maintenance And Repair3%

“Works great as temporary repair”

Ease Of Use3%

“Easy to use”

Filtration3%

“It seems to genuinely assist with leaks around the filter area”

Ease Of Cleaning1%

“Driveway clean and clear as ever”

What buyers complain about

Leak-Proof53%

“for being a slight leak”

Functionality-Overall17%

“it did not work in my case”

Value For Money5%

“the price has more than doubled”

Maintenance And Repair2%

“would need to be replaced entirely”

Filtration1%

“changed filter I hope I did not damaged my engine”

Advertised Vs Actual Product1%

“It did not work as they claims”

Certifications1%

“If I gave it a grade it would be a F+ Did not help at all”

Lubrication1%

“It's a solvent”

Durability1%

“disappointed lasted just a year it would appear”

Adhesion/Stickiness1%

“It formed sticky deposit causing intake manifold runner valve to fail in cold weather”

Top return reasons

Leak-Proof45%

Compatibility-Overall14%

Functionality-Overall11%

Advertised Vs Actual Product8%

Value For Money6%

Defective Material/Parts2%

Motor Issues2%