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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Bar's Leaks CONCENTRTD REAR MAIN SEAL

Product ID: 257815528

Details

Brand
Bar's Leaks
Item weight
1.1 Pounds
Liquid volume
16.9 Fluid
Material
Chemical
Package information
Bottle

🔧Seals multiple engine oil leak points

⏱️Stops leaks within 100 miles/2 days

🛢️16.9 fl oz concentrated formula

KD 9.18

Duties & taxes included

In stock

Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

RAPID RESULTS - Most leaks stop within just 100 miles or 2 days—get back on the road faster without messy repairs.
EASY APPLICATION - Simply add the entire bottle to your engine crankcase during oil changes—no special tools or expertise needed.
TRUSTED PROVEN - Backed by thousands of 4.2-star reviews and a top rank in oil additives—join the savvy drivers who refuse to leak.
PRECISION LEAK SEALING - Specifically engineered to target rear main seals and tough oil leaks with superior effectiveness.
ALL IN ONE ENGINE PROTECTION - Works beyond rear main seals—seals timing cover, cam seals, and other hard-to-fix leaks effortlessly.

Bar's Leaks Concentrated Rear Main Seal is a powerful 16.9 fl oz liquid additive designed to stop rear main and other stubborn engine oil leaks quickly and effectively. Easy to use during oil changes, it seals leaks within 100 miles or 2 days, protecting your engine without costly repairs. Trusted by thousands, it’s a must-have for proactive vehicle maintenance.

Specifications

ASIN	B00754T6TK
Best Sellers Rank	#19,437 in Automotive ( See Top 100 in Automotive ) #131 in Oil & Fluid Additives
Brand Name	Bar's Leaks
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (2,840)
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
Material	Chemical
Model Number	1040
Number of Items	1
Part Number	1040
Recommended Uses For Product	Automotive
Specific Uses For Product	Sealing engine oil leaks
UPC	046087010402
Unit Count	16.9 Milliliters

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