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

🔧Easy add-in at oil change

⏱️Stops leaks within 100 miles/2 days

🛢️16.9 oz concentrated formula

€ 29.57

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal before your ride’s secret’s out!

DIY FRIENDLY - Simply add to your engine oil—no mechanic needed, no hassle involved
FAST TRACK FIX - Most leaks sealed within 100 miles or 2 days—get back on the road without delay
TRUSTED LEGACY - Since 1947, Bar’s Leaks has been the go-to for reliable, affordable leak repair
SEAL LIKE A PRO - Specifically engineered to restore rear main seals and stop tough oil leaks fast
UNIVERSAL COMPATIBILITY - Works seamlessly with gasoline, diesel, synthetic, and high mileage oils

Bar's Leaks Rear Main Seal Repair is a 16.9 oz concentrated liquid formula designed to quickly restore worn or dried rear main seals and stop oil leaks. Compatible with all engine types and oils, it’s added directly to the crankcase at oil changes, sealing most leaks within 100 miles or 2 days. Trusted since 1947, it offers an affordable, easy DIY solution to keep your engine leak-free and your drive worry-free.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#5,825 in Automotive ( See Top 100 in Automotive ) #18 in Fuel Additives
Brand Name	Bar's Leaks
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (3,005)
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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TrustScore 4.5 | 7,300+ reviews

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

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