rear main seal
Worth a look55/100rear main seal shows demand growing +269.8%, but a small market ($200K/yr) keeps it on the watch list.
Market/yr
$200K
Growth (1y)
+269.8%
Products
58
Brands
17
was 12 a year ago
Sellers
113
Price range
$6.68–$69.20
Returns
3.5%
Rating
4.5★
Worth a look
Scored 55/100 across market size, growth, competition, quality gap, and returns.
Demand
Weekly Amazon search volume, last 104 weeks — +269.8% year over year.Seasonality
Monthly demand index across the year — 1.00 is average.Peak months: Mar · busiest ÷ quietest = 1.6×
Competition
- Fel-Pro47%
- Dorman14%
- ACDelco9%
- National6%
- A-Premium6%
- GM GENUINE PARTS6%
- Other (11 brands)12%
Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen. 17 brands and 113 sellers compete here.
Brands
17 rising
was 12 a year ago
Sellers
113
Top 5 brand share
82%
Product shelf
All 58 tracked products in this niche.
Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models
Dorman
$49.634.6★1,169 reviews
FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500
Fel-Pro
$21.594.8★2,112 reviews
![A-Premium Engine Rear Main Seal Cover Kit [OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models](https://m.media-amazon.com/images/I/41gRkRB2CrL.jpg)
A-Premium Engine Rear Main Seal Cover Kit [OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models
A-Premium
$36.374.1★349 reviews
FEL-PRO TCS 46117 Engine Crankshaft Seal Kit for Ford F-150
Fel-Pro
$8.374.7★495 reviews
FEL-PRO TCS 46051 Engine Crankshaft Seal Kit for Honda CR-V
Fel-Pro
$8.344.7★535 reviews
FEL-PRO BS 40666 Rear Main Seal Set
Fel-Pro
$11.164.7★259 reviews
FEL-PRO BS 40644 Engine Crankshaft Seal Kit for Ford F-150
Fel-Pro
$19.714.6★381 reviews
FEL-PRO BS 40620 Engine Crankshaft Seal Kit for Ford F-150
Fel-Pro
$11.574.5★375 reviews
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Fit perfect”
“Excellent product”
“Not leaking”
“Works as it should”
“Good purchase for the price”
“Easy install”
“Works great”
“Seals the rear main as it should”
“Best 4.0 RMS out there”
“Easier to guide and push in”
What buyers complain about
“Leaking”
“Doesn't work for d16y7 or d16y8”
“ID is slightly smaller”
“Junk”
“Lasted 6 months and blew out”
“Received unusable part”
“This is actually thicker than the factory cover”
“I replaced it before setting the engine in the new frame to save myself the headache of having to replace it later”
“I lost oil pressure late January 2026”
Top return reasons
- Size-Overall40%
- Leak-Proof9%
- Compatibility-Overall9%
- Defective Material/Parts8%
- Value For Money8%
- Advertised Vs Actual Product7%
- Product Condition3%
- Quality-Overall3%
- Maintenance And Repair2%
- Assembly/Installation2%