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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Low Oil Level?

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

⛽Stops leaks in 100 miles

🔧Easy add-in at oil change

🛢️16.9 oz concentrated formula

390 kr

Duties & taxes included

In stock

Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

QUICK FIX FORMULA - Most leaks stop within 100 miles or 2 days—get back on the road faster.
TRUSTED SINCE 1947 - Proven chemical solution with thousands of happy drivers and top rankings.
LEAK PROOF CONFIDENCE - Seals rear main, cam, and timing cover leaks fast—no mechanic needed.
SIMPLE DIY APPLICATION - Just add the full bottle to your crankcase during oil change—no mess, no stress.
UNIVERSAL ENGINE COMPATIBILITY - Works with gasoline, diesel, synthetic, and high mileage oils for all engines.

Bar's Leaks Rear Main Seal Repair is a 16.9 oz concentrated liquid formula designed to quickly stop oil leaks from rear main seals, cam seals, and timing covers. Compatible with all gasoline and diesel engines using conventional, synthetic, or high mileage oils, it restores worn seals and prevents future leaks. Easy to use by adding directly to the engine oil at oil changes, it typically stops leaks within 100 miles or 2 days, offering an affordable, DIY alternative to costly repairs.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#5,418 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 (3,017)
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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