Is this safe for diesels, specifically the Duramax 6.6L?

Yes..... According to Bars Product, this is compatible with all engines and engine oils.

Can you use this with synthetic oils

Yes, I have used it with synthetic oil with no issues.

What it does with my other gasket that has not have a leak?

If I'm understanding your question correctly.... you would like to know what effect this has on gaskets that are not leaking? The answer is nothing..... Thank you Eric

Is this safe to use with other gas additives such as seafoam, lucas?

Yes there is no problem. This gets poured into your oil crankcase not into your gasoline. Seafoam usually gets poured into your gas tank to clean injectors and cylinder walls sometimes you can put it in the crankcase just about 4 oz to clean junk this does not stop any leaks usually done 100 or 200 mi before an oil change. Lucas has many products some that are injector cleaners that go into the fuel tank some that are oil stabilizers or stop leaks or friction additives that go into your oil crankcase you can have Lucas oil additive/stop leak and bars leak in your oil crankcase they don't interfere with one another

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Bar's Leaks CONCENTRTD REAR MAIN SEAL

Product ID: 257815528

Details

Brand
Bar's Leaks
Item weight
499 g
Liquid volume
16.9 Fluid
Material
Chemical
Package information
Bottle

🔧Multi-leak sealing: rear main, cam, timing cover

⏱️Stops leaks within 100 miles/2 days

🛢️16.9 fl oz powerful sealant

£34.64

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

🛠️ Seal the deal on leaks before they seal your fate!

RAPID RESULTS - Experience leak stoppage in as little as 100 miles or 2 days—get back on the road faster and worry-free.
EASY APPLICATION - Simply add the entire bottle to your engine crankcase during oil changes—no mess, no hassle.
TRUSTED PERFORMANCE - Backed by thousands of 4.2-star reviews, join a community of savvy drivers who refuse to compromise on engine care.
VERSATILE PROTECTION - Outperforms conventional stop-leak products by sealing timing covers and other hard-to-fix oil leaks.
PRECISION LEAK SEALING - Specifically engineered to target stubborn rear main and camshaft oil leaks with unmatched efficiency.

Bar's Leaks Concentrated Rear Main Seal is a 16.9 fl oz liquid additive designed to effectively seal rear main, camshaft, timing cover, and other hard-to-stop engine oil leaks. Applied directly to the engine crankcase during oil changes, it delivers fast results—typically stopping leaks within 100 miles or 2 days of driving. Trusted by thousands with a 4.2-star rating, this product offers a hassle-free, versatile solution to extend engine life and prevent costly repairs.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#21,458 in Automotive ( See Top 100 in Automotive ) #142 in Oil & Fluid Additives
Brand Name	Bar's Leaks
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (2,837)
Global Trade Identification Number	00046087010402
Included Components	One bottle Bar's Leaks Rear Main Seal Repair
Item Form	Liquid
Item Type Name	Bar's Leaks Rear Main Seal Repair
Item Weight	499 g
Liquid Volume	16.9 Fluid Ounces
Manufacturer	Bar's Leaks
Material	Chemical
Model Number	1040
Number of Items	1
Part Number	1040
Recommended Uses For Product	Automotive
Specific Uses For Product	Sealing engine oil leaks
UPC	046087010402
Unit Count	16.9 Milliliters

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.