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

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Rear Main Seal Repair, 16.9 oz

Product ID: 3673728

Details

Brand
Bar's Leaks
Item Weight
1.1 Pounds
Liquid Volume
16.9 Fluid
Package Information
Bottle
Recommended Uses For Product
Fleet and

🔧Works on rear main, cam, timing cover seals

⏱️Stops leaks within 100 miles/2 days

🛢️16.9 oz concentrated formula

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€ 21.95

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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 without costly repairs.
EFFORTLESS APPLICATION - Simply add the entire bottle to your engine crankcase during oil changes—no mechanic needed, no hassle.
PRECISION LEAK SEALING - Specifically engineered to restore and seal rear main and other hard-to-fix oil leaks with unmatched efficiency.
TRUSTED LEGACY SINCE 1947 - Backed by decades of proven performance, Bar’s Leaks is the go-to solution for professional-grade seal repair.
UNIVERSAL ENGINE COMPATIBILITY - Safe and effective for all gasoline and diesel engines, including conventional, high mileage, and synthetic oils.

Bar’s Leaks Rear Main Seal Repair is a 16.9 oz concentrated liquid formula designed to quickly restore and seal rear main, cam, and timing cover oil leaks. Compatible with all gasoline and diesel engines, it stops leaks within 100 miles or 2 days of driving. Easy to use by adding directly to the engine oil, this trusted solution has been a leader in automotive leak repair since 1947.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#6,801 in Automotive ( See Top 100 in Automotive ) #14 in Fuel Additives
Brand Name	Bar's Leaks
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (3,131)
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	1.1 Pounds
Liquid Volume	16.9 Fluid Ounces
Manufacturer	Bar's Leaks
Model Number	1040
Number of Items	1
Part Number	1040
Recommended Uses For Product	Fleet and plant maintenance.
Specific Uses For Product	Fleet and plant maintenance.
UPC	046087010402
Unit Count	16.9 Ounce
Warranty Description	No

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€ 21.95

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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