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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Bar's Leaks Rear Main Seal Repair, 16.9 oz

Bar's Leaks 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 in 100 miles/2 days

🛢️16.9 oz precision dose

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€ 27.93

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fix leaks like a pro—no garage drama, just smooth rides!

PLUG PLAY SIMPLICITY - Add entire bottle directly to crankcase oil—no mechanic needed, no engine disassembly required.
COST SAVING MAINTENANCE - Postpones expensive seal replacements—trusted by thousands to keep leaks at bay mile after mile.
SEAL REVIVAL TECHNOLOGY - Swells and restores dried, hardened rubber seals to like-new condition, extending engine life.
LEAK STOPPING POWERHOUSE - Specifically engineered to seal stubborn rear main and other hard-to-fix oil leaks fast.
UNIVERSAL ENGINE COMPATIBILITY - Effective with gasoline, diesel, synthetic, and high mileage oils for all engine types.

Bar’s Leaks Rear Main Seal Repair (16.9 oz) is a trusted, easy-to-use additive that rejuvenates worn rubber seals in your engine, stopping oil leaks from the rear main, cam, and timing cover seals. Designed for all gasoline and diesel engines, it works within 100 miles or 2 days to restore seal integrity without disassembly, saving you costly repairs and downtime. Proven since 1947, it’s the go-to solution for professional-grade leak control and engine maintenance.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#5,074 in Automotive ( See Top 100 in Automotive ) #15 in Fuel Additives
Brand Name	Bar's Leaks
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (3,127)
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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