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

ENGINE OIL FRIENDLY - Works seamlessly with high mileage, synthetic, and all petroleum-based oils.
PRECISION DOSAGE CONTROL - One bottle treats up to 6 quarts of oil—perfect for cars and small engines alike.
UNIVERSAL LEAK PROTECTION - Stops oil leaks on gas, diesel & turbo engines—no exceptions.
MULTI GASKET COMPATIBILITY - Effectively seals timing covers, cam seals, O-rings, and more.
ADVANCED REAR MAIN SEAL REPAIR - Specifically engineered to restore and seal the toughest rear main leaks.

Bar's Leaks 1040-6PK is a powerful, specialized additive pack designed to stop and repair oil leaks, especially rear main seal leaks, across all vehicle types including gas, diesel, and turbocharged engines. Compatible with all petroleum-based oils, it restores worn seals and prevents further leakage, ensuring engine longevity and peace of mind.

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Manufacturer	Bar's Leaks
Brand	Bar's Products
Model	1040-6PK
Product Dimensions	19.3 x 8.64 x 5.08 cm; 3.16 kg
Item model number	1040-6PK
Item Dimensions L x W x H	19.3 x 8.6 x 5.1 cm
Voltage	12 Volts
Item Weight	3.16 Kilograms

Bar's Leaks 1040 濃縮 Pack of 6 1040-6PK

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