Best Rear Main Sealers: Top Picks to Fix Oil Leaks Fast

Looking for the best rear main sealers? We provide reviews and recommendations of top rear main sealers to help you fix oil leaks and keep your engine running smoothly.

Oil leaks can be a headache for any vehicle owner. A rear main seal leak is one of the toughest to fix. Luckily, there are reliable solutions to stop these leaks and save you money.

We’ve tested and reviewed the best rear main sealers on the market. Whether you need a quick fix or a permanent solution, we’ve got you covered. Discover the top products that will keep your engine leak-free and running smoothly.

List of Top 10 Rear Main Sealers

Title	Best For	Price
Bar’s Leaks Rear Main Seal Repair, 16.9 oz	This product is perfect for anyone with a car that has hard-to-stop oil leaks. It’s easy to use and works fast to fix leaks in your engine.	View on Amazon (paid link)
BlueDevil Products 00234 Rear Main Sealer – 8 Ounce	BlueDevil Rear Main Sealer is perfect for drivers who want a simple, permanent fix for leaky rear main seals. It’s easy to use and works while you drive, making it ideal for anyone with a gasoline or diesel engine.	View on Amazon (paid link)
BlueSeal Oil Stop Leak, Rear Main Seal Repair, Engine Oil Additive, 8 oz	BlueSeal Oil Stop Leak is perfect for car owners who want to fix leaks and protect their engines. It’s great for older cars or vehicles with high mileage where seals may be drying out.	View on Amazon (paid link)
BlueDevil Products 00234 Rear Main Sealer – 8 Ounce (Pack of 12)	This product is perfect for car owners who want to fix oil leaks easily. It’s great for DIY repairs without removing the engine.	View on Amazon (paid link)
Subaru Rear Main Seal for WRX STI Legacy Forester Impreza Outback Baja – 806786040 – Genuine OEM	This genuine OEM Subaru rear main seal is perfect for owners of compatible 1990 and newer Subaru vehicles. It fits Impreza, WRX, WRX STi, Forester, Legacy, Outback, Baja, SVX, and Tribeca models from their listed years.	View on Amazon (paid link)
Ford Racing M-6701-B302 Rear Main Seal for 5.0L Engine	This Ford Racing Rear Main Seal is perfect for car owners who want to boost their 5.0L engine’s performance. It’s great for those who trust Ford Racing and want reliable, fast shipping.	View on Amazon (paid link)
ORAEVY BS 40640 Rear Main Seal Gasket Set- Compatible with GM LS LS1 LS6 LS2 LS3 LQ9 LQ4 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra	This ORAEVY Rear Main Seal Gasket Set is perfect for car owners with GM LS engines who need a reliable replacement. It’s ideal for DIY enthusiasts or professional mechanics looking for high-quality parts that fit perfectly and last long.	View on Amazon (paid link)
DNJ RM411 Rear Main Seal For 82-16 Ford, Mazda 2.3L-6.8L V10, V8, V6, L4 SOHC, DOHC, OHV Naturally Aspirated, Supercharged	This DNJ RM411 Rear Main Seal is perfect for car owners with 82-16 Ford or Mazda vehicles that have 2.3L-6.8L engines. It’s ideal for those needing a reliable replacement to keep their car running smoothly.	View on Amazon (paid link)
DNJ RM928 Rear Main Seal for 2008-2022 Lexus, Pontiac, Scion, Toyota C-HR, Corolla, Corolla iM 1.8L-2.0L L4 16V DOHC 1798cc	This brand new DNJ rear main seal is perfect for 2008-2022 Lexus, Pontiac, Scion, Toyota C-HR, Corolla, or Corolla iM owners with 1.8L-2.0L L4 DOHC engines who need to fix a leaking rear main seal. It fits your car exactly, comes with a 1 year/12,000 mile limited warranty, and is made by a brand with 30+ years of trusted engine part quality.	View on Amazon (paid link)
LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 V8 Engines	This product is perfect for DIY car owners and small auto shop mechanics who work on 1997-2013 Chevy, GMC, and Cadillac V8 trucks and SUVs. It’s made for anyone tired of messy rear main seal oil leaks who wants a durable, all-in-one fast install fix.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Rear Main Sealers carefully selected for performance and value. Each product is expert-reviewed and backed by customer feedback to ensure reliable results. Whether you need a permanent fix or affordable solution, this guide has you covered. Find the perfect sealer to keep your engine leak-free and running smoothly.

1. Bar’s Leaks Rear Main Seal Repair, 16.9 oz

Bar’s Leaks Rear Main Seal Repair stops hard to fix oil leaks. It seals rear main, timing cover, and cam seal leaks. You add it straight to your engine oil.

This product is made to fix rear main seal leaks first. It works better than regular stop leak on all other leaks too. Pour the full bottle into your engine oil.

Add the bottle at or between oil changes. Most leaks stop in 2 days or 100 miles of driving, and do not overfill your oil.

Pros	Cons
Stops hard-to-fix oil leaks fast and effectively. Easy to use—just add to engine oil. Works better than conventional stop leaks. Seals multiple leaks, not just the rear main. Quick results—stops leaks in 100 miles or 2 days.	Not a permanent fix, may need repeated use. Can’t use with synthetic oil, limits engine compatibility. Overfilling risk if not measured carefully.

Perfect For:

This product is perfect for anyone with a car that has hard-to-stop oil leaks. It’s easy to use and works fast to fix leaks in your engine.

Ready to Purchase?

View Price on Amazon (paid link)

Best Rubber Seal Restorers For Engines

2. BlueDevil Products 00234 Rear Main Sealer – 8 Ounce

BlueDevil Rear Main Sealer is a permanent fix for leaky rear main seals. It stops oil leaks by flowing into damaged areas and sealing them tightly. Your engine stays protected without needing repeated treatments.

Pour it into your engine oil, drive as usual, and let it work. It’s safe, easy, and effective. No special tools or skills needed.

Works on all engines, gas or diesel, with any oil type. It restores rubber seals while you drive, keeping your vehicle running smoothly. Avoid brakes and painted surfaces for best results.

Pros	Cons
Permanent fix stops rear main oil leaks Easy to use pour into engine oil Restores old seals while you drive Safe formula won’t harm engine seals Works with all oil and engine types	Not for brakes or painted surfaces, limits use in some car parts. No quick fix, requires driving to restore seals fully. Avoid overuse, follow instructions to prevent engine issues.

Perfect For:

BlueDevil Rear Main Sealer is perfect for drivers who want a simple, permanent fix for leaky rear main seals. It’s easy to use and works while you drive, making it ideal for anyone with a gasoline or diesel engine.

Ready to Purchase?

View Price on Amazon (paid link)

3. BlueSeal Oil Stop Leak, Rear Main Seal Repair, Engine Oil Additive, 8 oz

BlueSeal Oil Stop Leak is a petroleum-free formula. It conditions rubber seals in engines. This USA-made product is safe for all engines.

It works in gasoline and diesel engines. Use it in transmissions and power steering too. No special tools or disassembly needed.

Pour it directly into the oil sump. Great for existing leaks and preventive care. Simple and effective for all vehicles.

Pros	Cons
Petroleum-free, non-clogging formula protects engines Safe for gasoline and diesel engines alike Reconditions seals in multiple vehicle systems No tools or disassembly needed for use Fixes leaks, protects high-mileage vehicle seals	Won’t stop large, long-running oil leaks Can’t fix cracked or torn rubber seals Needs multiple drives to work fully

Perfect For:

BlueSeal Oil Stop Leak is perfect for car owners who want to fix leaks and protect their engines. It’s great for older cars or vehicles with high mileage where seals may be drying out.

Ready to Purchase?

View Price on Amazon (paid link)

4. BlueDevil Products 00234 Rear Main Sealer – 8 Ounce (Pack of 12)

BlueDevil Rear Main Sealer stops oil leaks fast. It fixes the rear main seal and timing cover leaks. This permanent repair works while you drive.

The non-damaging formula is safe for all engines. It works with gas and diesel engines. Use it with synthetic or regular oil.

Easy to use, just pour it in. No need to take apart the engine. Restores worn seals and keeps your car leak-free.

Pros	Cons
Stops oil leaks fast with permanent rear main seal repair. Restores worn seals while you drive, no disassembly needed. Safe for all engines, gas or diesel, synthetic or conventional oils. Non-damaging formula protects seals, easy pour-in application.	Not instant fix: Takes time to seal leaks while driving. No visible results: Can’t see if it’s working until leak stops. Single use: One bottle may not fix all leaks in every case.

Perfect For:

This product is perfect for car owners who want to fix oil leaks easily. It’s great for DIY repairs without removing the engine.

Ready to Purchase?

View Price on Amazon (paid link)

5. Subaru Rear Main Seal for WRX STI Legacy Forester Impreza Outback Baja – 806786040 – Genuine OEM

Keep your Subaru running smoothly with this genuine rear main seal. It’s designed for 1990 and newer Subaru models.

This seal fits many popular Subaru cars, like the Impreza, WRX, and Forester. It also works for Legacy, Outback, and Baja models.

Made by Subaru, this part is reliable and built to last. It ensures no leaks and long-lasting performance.

Pros	Cons
Genuine OEM part ensures perfect fit and reliable performance. Wide compatibility for multiple Subaru models and years. Durable seal prevents leaks and extends engine life. Easy installation saves time and effort.	Not universal, fits only specific Subaru models and years. OEM pricing can be higher than aftermarket options. Professional installation often required, adding extra cost.

Perfect For:

This genuine OEM Subaru rear main seal is perfect for owners of compatible 1990 and newer Subaru vehicles. It fits Impreza, WRX, WRX STi, Forester, Legacy, Outback, Baja, SVX, and Tribeca models from their listed years.

Ready to Purchase?

View Price on Amazon (paid link)

6. Ford Racing M-6701-B302 Rear Main Seal for 5.0L Engine

Ford Racing is a trusted name in the industry. The M-6701-B302 Rear Main Seal is a top-quality product. It is designed for 5.0L engines.

This seal offers great performance and enhances your vehicle’s overall functionality. It is backed by a manufacturer’s warranty, ensuring peace of mind.

Fast shipping is available for this product. It is a reliable choice for your engine. Upgrade your vehicle with this high-quality seal.

Pros	Cons
Trusted Ford Racing certified performance seal Backed by full manufacturer warranty protection Boosts 5.0L engine great performance output Gives your 5.0L vehicle perfect fit Ships fast for quick easy install	Only fits 5.0L engines, not universal. No tools included, extra purchase needed. Warranty details may require extra steps.

Perfect For:

This Ford Racing Rear Main Seal is perfect for car owners who want to boost their 5.0L engine’s performance. It’s great for those who trust Ford Racing and want reliable, fast shipping.

Ready to Purchase?

View Price on Amazon (paid link)

7. ORAEVY BS 40640 Rear Main Seal Gasket Set- Compatible with GM LS LS1 LS6 LS2 LS3 LQ9 LQ4 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra

ORAEVY BS 40640 Rear Main Seal Gasket Set- Compatible with GM LS LS1 LS6 LS2 LS3 LQ9 LQ4 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra

This ORAEVY BS 40640 rear main seal gasket set fits GM LS engines. It works with Chevy Silverado, Suburban, Tahoe and GMC Sierra models from 1999 to 2020. It meets original equipment standards for long lasting, reliable use.
Your purchase includes the gasket set, free installation gloves, a cleaning brush and 12 month warranty. You get full after sales support if you have any questions or issues.

Pros	Cons
Exact OE match for GM LS engines Fits 1999-2020 Chevy GMC GM models Super durable for high heat pressure Free install accessories included in set 12 month warranty for peace of mind	May not fit some engine variants Gaskets can break if mishandled Installation needs proper tools

Perfect For:

This ORAEVY Rear Main Seal Gasket Set is perfect for car owners with GM LS engines who need a reliable replacement. It’s ideal for DIY enthusiasts or professional mechanics looking for high-quality parts that fit perfectly and last long.

Ready to Purchase?

View Price on Amazon (paid link)

8. DNJ RM411 Rear Main Seal For 82-16 Ford, Mazda 2.3L-6.8L V10, V8, V6, L4 SOHC, DOHC, OHV Naturally Aspirated, Supercharged

This is a brand new DNJ rear main seal. It fits 1982 to 2016 Ford and Mazda vehicles. It works with 2.3L to 6.8L V10, V8, V6, and L4 engines.
It fits models without Bullitt or VIN V, plus Bullitt models from after 12/01/82. It also works with SOHC, DOHC, OHV, naturally aspirated and supercharged engines.
DNJ Engine Components makes full line domestic and Japanese engine parts. It has a 30+ year track record of quality and trust. We chose it as our sole provider for this seal.

Pros	Cons
Brand-new DNJ® Rear Main Seal for reliable performance. Fits 82-16 Ford, Mazda 2.3L-6.8L engines perfectly. Trusted DNJ quality with 30+ years of experience. Easy fitment for naturally aspirated and supercharged engines.	Limited to specific Ford, Mazda models and engines. No mention of warranty or guarantee details. Not for Bullitt editions, check VIN carefully.

Perfect For:

This DNJ RM411 Rear Main Seal is perfect for car owners with 82-16 Ford or Mazda vehicles that have 2.3L-6.8L engines. It’s ideal for those needing a reliable replacement to keep their car running smoothly.

Ready to Purchase?

View Price on Amazon (paid link)

9. DNJ RM928 Rear Main Seal for 2008-2022 Lexus, Pontiac, Scion, Toyota C-HR, Corolla, Corolla iM 1.8L-2.0L L4 16V DOHC 1798cc

This is a brand new DNJ rear main seal for your vehicle. It fits 2008–2022 Lexus, Pontiac, Scion, and Toyota C-HR, Corolla, and Corolla iM models with 1.8L or 2.0L L4 engines.

It comes with a 1 year or 12,000 mile limited DNJ warranty. DNJ Engine Components has over 30 years of experience making trusted domestic and Japanese engine parts.

It is a strong replacement part. It fits your engine correctly. It stops oil leaks.

Pros	Cons
Brand new DNJ® Rear Main Seal for reliable performance. Fits multiple models, ensuring perfect compatibility for your car. 1-year warranty or 12,000 miles for peace of mind. Trusted 30+ years of DNJ® quality and expertise.	Limited vehicle compatibility – only fits specific models and engines. No installation tools included – requires extra purchase. Warranty restrictions – only covers 1 year or 12,000 miles.

Perfect For:

This brand new DNJ rear main seal is perfect for 2008-2022 Lexus, Pontiac, Scion, Toyota C-HR, Corolla, or Corolla iM owners with 1.8L-2.0L L4 DOHC engines who need to fix a leaking rear main seal. It fits your car exactly, comes with a 1 year/12,000 mile limited warranty, and is made by a brand with 30+ years of trusted engine part quality.

Ready to Purchase?

View Price on Amazon (paid link)

10. LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 V8 Engines

Fix oil leaks and protect your engine with the LS Rear Main Seal Cover & Gasket Bolts. Designed for 1997-2013 V8 engines, this kit fits LS1, LS2, LS3, and more.

Made from cast aluminum, it’s durable and heat-resistant. The kit includes all gaskets and bolts needed for a leak-proof seal.

Easy to install, meets OE specs, and backed by ARMKER support. Keep your engine running smoothly.

Pros	Cons
Perfect OE fit for 1997-2013 LS V8 engines Cast aluminum build stops long-term oil leaks Complete bolt and gasket kit has all required parts Easy OE-spec install saves time and effort Friendly customer support answers questions quickly	Only fits 1997-2013 LS V8 engines Needs basic mechanical installation skill No installation guide included in kit

Perfect For:

This product is perfect for DIY car owners and small auto shop mechanics who work on 1997-2013 Chevy, GMC, and Cadillac V8 trucks and SUVs. It’s made for anyone tired of messy rear main seal oil leaks who wants a durable, all-in-one fast install fix.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Oil leaks can be a big problem for your car. A rear main seal leak is one of the hardest to fix. Luckily, there are great products to help you stop these leaks and save money.

Choosing the right rear main sealer can be easy and stress-free. We’ve tested and reviewed the best options to help you make a smart choice. Here’s what to look for when buying:

Type of Sealant:
Choose between a quick fix or a permanent solution. Quick fixes are easy to use but may not last long. Permanent solutions take more time but stop leaks for good.
Compatibility:
Make sure the product works with your engine type (gas or diesel) and oil type (synthetic or regular). Check if it’s safe for all engines or specific to your car.
Ease of Use:
Look for products that are simple to apply. Most just need to be poured into the engine oil. Avoid options that require special tools or engine disassembly.
Effectiveness:
Read reviews to see how well the product stops leaks. Some work in 2 days or 100 miles, while others take longer. Choose one that fits your needs.
Safety:
Ensure the product is safe for your engine and won’t cause damage. Avoid formulas that may harm rubber seals or other parts.
Brand Reputation:
Go for trusted brands with a good track record. Brands like Bar’s Leaks and BlueDevil are known for their reliable products.
Price and Value:
Compare prices to find the best deal. Some products come in packs or with extra tools, offering more value for your money.

With these tips, you’ll find the perfect rear main sealer to keep your car leak-free and running smoothly.