Is this sealant approved for use with gasoline fitting applications?

It is specially designed for use in fittings handling gasoline and gasoline blends up to 85% ethanol. See technical specs here: https://www.fedprobrands.com/products/pipe-thread-sealants/gasoila-e-seal-thread-sealant.html

Is this appropriate for fittings on a dispensing pump for diesel fuel?

It’s about the best I’ve found for any diesel or gasoline engine application.

Will this work on gas tank drain plug that is leaking slightly??

Depends on why the plug is leaking. If the plug is threaded and the threads are damaged, probably not. If by "slightly" you mean weeping and if the threads are ok, then it may be sufficient. The reason that I used Gasoila E-seal was because of its resistance to degradation by Ethanol, especially in high percentage Ethanol/Gasoline blends. The product is a sealer, not a glue or filler.

Has anyone used this on fittings that are exposed to engine oil?

It is rated for use with ethanol gasoline. Ethanol is much more harsh than engine oil. I would just avoid getting it inside an engine.

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- Thread Sealant for Ethanol E10 & E85 Applications, Non-Hardening, Non-Toxic, Opaque Dark Green Paste – USA-Made, 1/4 Pint – Ideal for Pipe Threads, Motors, Fuel Lines & More, Brush in Cap

Product ID: 6359719

Details

Material
Sealant
Brand
Gasoila
Style
Industrial
Item Weight
0.21 Kilograms
Item dimensions L x W x H
2 x 3 x 4

⛽E10 & E85 ethanol-safe

🛠️Non-hardening, flexible seal

🇺🇸USA-made, small batch quality

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€ 38.72

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal with confidence—fuel your projects with Gasoila’s ethanol-proof power!

ETHANOL BLEND READY - Specifically formulated for E10 & E85 fuels, ensuring leak-proof, chemical-resistant seals where it matters most.
BROAD INDUSTRIAL USE - Ideal for fuel lines, motors, compressors, hydraulic systems, and more—trusted by pros for reliable, long-lasting performance.
PRECISION APPLICATION - Innovative brush-in-cap design delivers mess-free, professional-grade application every time—no waste, no fuss.
MULTI MATERIAL MASTERY - Works seamlessly on brass, copper, stainless steel, aluminum, black pipe, tin, and galvanized fittings for ultimate versatility.
FLEXIBLE DURABLE SEAL - Non-hardening and non-toxic paste stays pliable in extreme temps (-100°F to 600°F), preventing cracks and leaks over time.

Gasoila Thread Sealant is a USA-made, non-toxic, non-hardening dark green paste engineered for ethanol-blended fuels (E10 & E85). It provides a flexible, durable seal compatible with multiple metals and withstands extreme temperatures from -100°F to 600°F. Designed for professional use with a convenient brush-in-cap, it ensures precise, mess-free application across a wide range of fuel and hydraulic system applications.

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