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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🛠️ Fix leaks like a pro—without the shop visit!

RAPID RESULTS - Most leaks stop within 2 days or 100 miles of driving.
TRUSTED LEGACY - Proven since 1947 to keep your engine leak-free and road-ready.
DIY FRIENDLY FORMULA - Simply add to engine oil—no mechanic needed, no hassle.
LEAK PROOF CONFIDENCE - Seals rear main, cam, and timing cover leaks with precision.
UNIVERSAL COMPATIBILITY - Works with gasoline, diesel, synthetic, and high mileage oils.

Bar's Leaks Rear Main Seal Repair is a 16.9 oz liquid additive designed to stop oil leaks from rear main seals, cam seals, and timing covers. Easy to use by adding directly to engine oil, it works quickly—typically within 100 miles or 2 days—and is compatible with all engine types and oil formulations. Trusted since 1947, it restores worn seals and prevents costly repairs.

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Brand	Bar's Leaks
Package Information	Bottle
Liquid Volume	16.9 Fluid Ounces
Item Weight	1.1 Pounds
Item Form	Liquid
Global Trade Identification Number	00046087010402
Manufacturer	Bar's Leaks
Unit Count	16.9 Ounce
UPC	046087010402
Number of Items	1
Model	1040
Item Weight	1.1 pounds
Product Dimensions	1.9 x 3.4 x 7.7 inches
Item model number	1040
Is Discontinued By Manufacturer	No
Manufacturer Part Number	1040

Bar's Leaks Rear Main Seal Repair, 16.9 oz

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