---
title: "rear main seal stop leak — Niche Verdict: Skip it (40/100) | Amazon United States - Flapen"
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last_updated: "2026-07-10T02:55:35.636Z"
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  description: "a small market ($69K/yr) — rear main seal stop leak doesn't clear our bar today."
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# **rear main seal stop leak**

**Skip it****40/100 **

a small market ($69K/yr) — rear main seal stop leak doesn't clear our bar today.

**Market/yr**

**$69K**

**Growth (1y)**

**+132.7%**

**Products**

**9**

**Brands**

**6**

was 4 a year ago

**Sellers**

**89**

**Price range**

**$9.55–$198.26**

**Returns**

**0.6%**

**Rating**

**4.3★**

**Skip it**

Scored 40/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns

Market size

**3**

 ×0.30

Growth

**69**

 ×0.30

Competition

**11**

 ×0.20

Quality gap

**62**

 ×0.10

Returns

**95**

 ×0.10

## **Demand**

Weekly Amazon search volume, last 104 weeks — +132.7% year over year.

881440.5Holiday '24Spike '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26

## **Seasonality**

Monthly demand index across the year — 1.00 is average.

JFMAMJJASOND

No pronounced peak months · busiest ÷ quietest = 1.5×

## **Competition**

- BlueDevil Products42% - Bar's Leaks31% - atp automotive12% - XADO8% - Lucas Oil5% - Liqui Moly2% - Other0%

The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack. 6 brands and 89 sellers compete here.

**Brands**

**6 **▲rising

was 4 a year ago

**Sellers**

**89**

**Top 5 brand share**

**98%**

#ProductBrandPriceRatingReviewsClick shareTrend

1
![Bars Leaks Rear Main Seal Repair 16.9 oz](https://m.media-amazon.com/images/I/51XrCeXKSlL.jpg) [**Bars Leaks Rear Main Seal Repair 16.9 oz**](https://www.amazon.com/dp/B00754T6TK)

Bar's Leaks$9.554.2★3,14631%▲rising

2
![BlueDevil Products 00234 Rear Main Sealer - 8 Ounce](https://m.media-amazon.com/images/I/41O57g-F6WL.jpg) [**BlueDevil Products 00234 Rear Main Sealer - 8 Ounce**](https://www.amazon.com/dp/B0079JX4JO)

BlueDevil Products$15.104.1★3,55321%▼falling

3
![ATP Automotive AT-205 Re-Seal Stops Leaks 8 Ounce Bottle 1-Pack](https://m.media-amazon.com/images/I/418IfQ5xGVL.jpg) [**ATP Automotive AT-205 Re-Seal Stops Leaks 8 Ounce Bottle 1-Pack**](https://www.amazon.com/dp/B000NVW1LM)

atp automotive$21.014.5★21,80912%▲rising

4
![BlueDevil Products 49499 Oil Stop Leak - 8 Ounce](https://m.media-amazon.com/images/I/41sUti8Mt1L.jpg) [**BlueDevil Products 49499 Oil Stop Leak - 8 Ounce**](https://www.amazon.com/dp/B000OAEN7C)

BlueDevil Products$18.924.1★3,44010%▲rising

5
![BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)](https://m.media-amazon.com/images/I/41O57g-F6WL.jpg) [**BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)**](https://www.amazon.com/dp/B0DPXYVCZN)

BlueDevil Products$198.264.1★3,5539%▲rising

6
![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)](https://m.media-amazon.com/images/I/41ECMDL8WBL.jpg) [**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)**](https://www.amazon.com/dp/B00KFKOR0Y)

XADO$21.934.2★3688%▲rising

7
![Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart](https://m.media-amazon.com/images/I/31pTxkDnJXL.jpg) [**Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart**](https://www.amazon.com/dp/B00F96P58C)

Lucas Oil$12.044.6★1,3465%▼falling

8
![LM 1005 Oil Leak Stop 300 ml](https://m.media-amazon.com/images/I/31N+IQ+32QL.jpg) [**LM 1005 Oil Leak Stop 300 ml**](https://www.amazon.com/dp/B001CZSGTE)

Liqui Moly$20.194.4★7,5122%▲rising

9
![BlueDevil Products Hydraulic Stop Leak 32 oz | Restores Seals & Stops Leaks in Hydraulic Systems | Safe for Pumps Cylinders & Valves](https://m.media-amazon.com/images/I/41AoNeonFxL.jpg) [**BlueDevil Products Hydraulic Stop Leak 32 oz | Restores Seals & Stops Leaks in Hydraulic Systems | Safe for Pumps Cylinders & Valves**](https://www.amazon.com/dp/B00D46NSTM)

BlueDevil Products$23.884.3★6222%▲rising

## **Product shelf**

All 9 tracked products in this niche.

Top sellersNewestTrending

[![Bars Leaks Rear Main Seal Repair 16.9 oz](https://m.media-amazon.com/images/I/51XrCeXKSlL.jpg)**Bars Leaks Rear Main Seal Repair 16.9 oz** Bar's Leaks**$9.55**4.2★3,146 reviews](https://www.amazon.com/dp/B00754T6TK) [![BlueDevil Products 00234 Rear Main Sealer - 8 Ounce](https://m.media-amazon.com/images/I/41O57g-F6WL.jpg)**BlueDevil Products 00234 Rear Main Sealer - 8 Ounce** BlueDevil Products**$15.10**4.1★3,553 reviews](https://www.amazon.com/dp/B0079JX4JO) [![ATP Automotive AT-205 Re-Seal Stops Leaks 8 Ounce Bottle 1-Pack](https://m.media-amazon.com/images/I/418IfQ5xGVL.jpg)**ATP Automotive AT-205 Re-Seal Stops Leaks 8 Ounce Bottle 1-Pack** atp automotive**$21.01**4.5★21,809 reviews](https://www.amazon.com/dp/B000NVW1LM) [![BlueDevil Products 49499 Oil Stop Leak - 8 Ounce](https://m.media-amazon.com/images/I/41sUti8Mt1L.jpg)**BlueDevil Products 49499 Oil Stop Leak - 8 Ounce** BlueDevil Products**$18.92**4.1★3,440 reviews](https://www.amazon.com/dp/B000OAEN7C) [![BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)](https://m.media-amazon.com/images/I/41O57g-F6WL.jpg)**BlueDevil Products 00234 Rear Main Sealer - 8 Ounce (Pack of 12)** BlueDevil Products**$198.26**4.1★3,553 reviews](https://www.amazon.com/dp/B0DPXYVCZN) [![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)](https://m.media-amazon.com/images/I/41ECMDL8WBL.jpg)**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**$21.93**4.2★368 reviews](https://www.amazon.com/dp/B00KFKOR0Y) [![Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart](https://m.media-amazon.com/images/I/31pTxkDnJXL.jpg)**Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart** Lucas Oil**$12.04**4.6★1,346 reviews](https://www.amazon.com/dp/B00F96P58C) [![LM 1005 Oil Leak Stop 300 ml](https://m.media-amazon.com/images/I/31N+IQ+32QL.jpg)**LM 1005 Oil Leak Stop 300 ml** Liqui Moly**$20.19**4.4★7,512 reviews](https://www.amazon.com/dp/B001CZSGTE)

## **Reviews**

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

### **What buyers love **

**Leak-Proof**41%

*“Stops leaks”*

**Quality-Overall**13%

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

**Efficiency**8%

*“It works great”*

**Value For Money**6%

*“Good price”*

**Advertised Vs Actual Product**4%

*“Works as advertised”*

**Lubrication**4%

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

**Maintenance And Repair**3%

*“Works great as temporary repair”*

**Ease Of Use**3%

*“Easy to use”*

**Filtration**3%

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

**Ease Of Cleaning**1%

*“Driveway clean and clear as ever”*

### **What buyers complain about **

**Leak-Proof**53%

*“for being a slight leak”*

**Functionality-Overall**17%

*“it did not work in my case”*

**Value For Money**5%

*“the price has more than doubled”*

**Maintenance And Repair**2%

*“would need to be replaced entirely”*

**Filtration**1%

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

**Advertised Vs Actual Product**1%

*“It did not work as they claims”*

**Certifications**1%

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

**Lubrication**1%

*“It's a solvent”*

**Durability**1%

*“disappointed lasted just a year it would appear”*

**Adhesion/Stickiness**1%

*“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% - Maintenance And Repair2% - Jamming/Clogging1% - Design-Overall1%