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!

DIY FRIENDLY - No mechanic needed—just add to engine oil and get back on the road fast.
TRUSTED LEGACY - Proven performance since 1947, keeping engines leak-free and drivers worry-free.
CONCENTRATED FORMULA - 16.9 oz bottle delivers maximum seal restoration in one easy dose.
POWERFUL LEAK SEALING - Stops rear main, cam, and timing cover oil leaks with precision.
UNIVERSAL ENGINE COMPATIBILITY - Works seamlessly with gasoline, diesel, synthetic, and high mileage oils.

Bar's Products Leaks 1040 Grey Rear Main Seal Repair Concentrate is a 16.9 oz liquid solution designed to restore and seal worn or dried engine seals, stopping oil leaks from the rear main, cam, and timing cover. Compatible with all gasoline and diesel engines, including synthetic and high mileage oils, it offers a fast, easy, and affordable DIY fix trusted since 1947.

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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.

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

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Material	HAWA
Brand	Bar's Leaks
Package Information	Bottle
Liquid Volume	16.9 Fluid Ounces
Item Weight	1.1 Pounds
Recommended Uses For Product	Automotive
Specific Uses For Product	Sealing engine oil leaks
Item Form	Liquid
Global Trade Identification Number	00046087010402
Manufacturer	Bar's Leaks
Net Quantity	16.9 gram
UPC	046087010402
Number of Items	1
Model	1040
Product Dimensions	4.83 x 8.64 x 19.56 cm; 498.95 g
Item model number	1040
Manufacturer Part Number	1040
Colour	Grey
Assembly Required	No
Item Weight	499 g

Bar's Products Leaks 1040 Grey Rear Main Seal Repair Concentrate - 16.9 oz

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