Best Sealant For Oil Drain Plug: Thread Sealants and RTV

#1 · Best Overall

1. Permatex 59214 Thread Sealant

• Weight: 0.64 oz

Best for: Threaded drain plug sealing.

Why it ranks #1: Its thread-sealing purpose and listed rear axle fill plug application are the closest match; it also resists leakage and vibration loosening.

Lubricating action is the key distinction of Permatex 59214: it helps threaded fittings assemble and disassemble easily while sealing them. For a drain-plug job where the plug itself has threads to seal, its thread-sealant format is more directly relevant than a silicone gasket maker.

The formula resists leakage and vibration loosening, useful where a threaded fitting faces movement or fluid exposure. It also resists moisture, hydraulic fluids, and diesel fuels, while the stated applications include a rear axle fill plug and oil lines. Parts may be repositioned for up to four hours after application, giving a repairer time to adjust a fitting. This is a 6 ml tube, so it suits targeted thread work rather than broad gasket coverage.

Skip it if you need a formed silicone gasket rather than threaded-fitting sealant; Permatex 82180 Ultra Black is the gasket-maker option here.

Choose this Permatex for a threaded drain plug or similar fitting when lubrication and repositioning matter. Its listed examples include a rear axle fill plug, but the 6 ml tube is a focused thread-sealing choice, not a broad gasket compound.

Listed on Amazon as: Permatex 59214 High Temperature Thread Sealant, 6 ml Tube

#2 · High-Pressure Pick

2. LOCTITE 565 Thread Sealant

• Weight: 1.6 oz
• Material Type: Metal, Oil, stainless steel
• Form: Liquid

Best for: High-pressure thread sealing.

Why it ranks #2: This automotive thread sealant replaces tapes and pipe dopes, and its listing says the fast-curing formula withstands pressures up to 10,000 PSI.

A stated pressure rating up to 10,000 PSI sets LOCTITE 565 apart as a high-viscosity thread sealant for demanding fittings. Its rapid-curing formula offers a tape-free alternative for buyers sealing threaded automotive connections rather than forming a silicone gasket around a joint.

LOCTITE says the sealant replaces traditional tapes, pipe dopes, and pre-coated parts, which can simplify a threaded-fitting workflow by avoiding those separate materials. Its high viscosity and rapid cure are paired with performance up to 10,000 PSI, useful when the specified pressure resistance matters. The liquid is listed for metal compatibility. For an oil drain plug, that points to thread-sealing use; it is not presented as a silicone gasket maker for flange surfaces.

Skip it if you need flexible silicone to form a gasket on a mating surface; J-B Weld 31314 Hi-Temp Red is a gasket-maker option.

Consider LOCTITE 565 for a metal threaded connection when a rapid-curing, high-pressure-rated sealant is the priority. For a drain plug, first ensure the repair calls for thread sealant, not a formed silicone gasket.

Listed on Amazon as: LOCTITE 565 Automotive White Thread Sealant – General Purpose, High Viscosity, Rapid Cure, Replaces Tapes & Pipe Dopes – 50 ml, 1 Pack

#3 · Oil-Resistance Pick

3. Permatex Ultra Black RTV

• Weight: 3 oz
• Material Type: Silicone
• Form: Paste

Best for: Oil-resistant gasket repairs.

Why it ranks #3: Its silicone gasket maker is formulated for oil resistance and superior adhesion to oily surfaces, but RTV is a gasket-forming alternative, not thread sealant.

A sensor-safe, non-corrosive formula with adhesion to oily surfaces distinguishes Permatex Ultra Black. Its silicone gasket-maker format suits repairs where oil resistance and flexibility matter, including applications needing a formed seal rather than sealant applied only to plug threads.

The product resists engine oil, transmission fluid, gear lube, and coolants, helping the seal remain suited to powertrain-fluid exposure. Its high-flexibility formula and adhesion to oily surfaces support gasket-making work where the mating area is not perfectly dry. The paste is compatible with aluminum, metal, and plastic. For an oil drain plug, this is a gasket-maker option; it is not described as a dedicated thread sealant, so the plug and sealing arrangement should suit that format.

Skip it if you want thread lubricant and repositioning time for a threaded plug; Permatex 59214 High Temperature Thread Sealant lists those uses.

Pick Ultra Black when an oil-exposed mating surface calls for flexible silicone gasket material and sensor-safe handling. For a drain plug sealed directly at its threads, its gasket-maker format may not match the repair method.

Listed on Amazon as: Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe and Non-Corrosive, for High Flex and Oil Resistant Applications 3 oz

#4 · Broad Fluid Range

4. Victor Reinz Reinzosil RTV

• Weight: 3.2 oz
• Material Type: Silicone
• Form: Liquid

Best for: Broad-fluid RTV gasket sealing.

Why it ranks #4: Reinzosil resists mineral and numerous synthetic oils, diesel, and other fluids, with a stated range from -58°F to 482°F.

Reinzosil’s listed resistance spans mineral and synthetic oils, fuels, water, sunlight, ozone, and salt water, giving this RTV broad exposure coverage. Its fast, acid-free cure and oxygen-sensor-safe description make it a versatile gasket-sealant candidate for fluid-exposed automotive joints.

The stated temperature range runs from -58°F to 482°F, with brief exposure up to 608°F, helping buyers judge whether a particular application falls within its listed limits. Resistance to mineral oils, synthetic oils, petrol, and diesel broadens its relevance beyond an engine-oil-only environment. Fast, acid-free curing and an odorless formula that will not harm oxygen sensors are useful installation considerations. It is universal, not vehicle- or application-specific, and is not identified as a dedicated thread sealant.

Skip it if you need a dedicated sealant for threaded fittings and thread lubrication; Permatex 59214 High Temperature Thread Sealant is specified for that work.

Choose Reinzosil for a universal RTV gasket application exposed to varied fluids, within its stated temperature limits. Its broad resistance does not make it a thread-specific drain-plug compound, so match it to the sealing surfaces involved.

Listed on Amazon as: Victor Reinz 70-31414-10 Reinzosil RTV Silicone – 70 ml Tube

#5

5. LOCTITE 598 RTV

• Weight: 4 oz
• Material Type: Metal
• Form: Liquid

Best for: Sensor-safe engine gasket work.

Why it ranks #5: This sensor-safe, non-corrosive automotive RTV offers oil resistance and flexibility, though its listing describes a gasket maker rather than a plug-thread sealant.

LOCTITE Black 598 pairs sensor-safe adhesion with a non-corrosive, non-conductive formula, a useful combination for engine gasket work near sensitive components. Its flexible, oil-resistant silicone is intended for formed seals, not specifically for applying to drain-plug threads.

The product tolerates minor oil contamination from motor oils and corrosion-protection oils, which can help when a perfectly oil-free surface is difficult to achieve. Its flexible, oil-resistant formula supports a gasket-style seal exposed to engine conditions, while low odor and non-corrosive, non-conductive properties are practical considerations around engine components. LOCTITE describes it as OEM-approved. The listed facts do not provide a temperature range, so buyers needing a stated limit should choose accordingly.

Skip it if you need a stated temperature limit for the sealant; J-B Weld 31314 Hi-Temp Red lists continuous service up to 650°F.

Choose Black 598 for flexible, oil-resistant silicone gasket work when sensor safety and tolerance of minor oil contamination matter. Its supplied information gives no temperature range, and it is not identified as a thread sealant for a plug.

Listed on Amazon as: LOCTITE Automotive RTV Silicone Gasket Maker Black 598 – High Performance, Sensor-Safe, Non-Corrosive, Flexible, Oil Resistant – 80 ml, 1 Pack

#6

6. Pro Seal RTV Silicone

• Weight: 0.01 oz

Best for: Sensor-safe gasket replacement.

Why it ranks #6: The listed oil-resistant RTV has a -75°F to 500°F range and is sensor safe, but it is a gasket-replacement product rather than thread sealant.

A 10-to-20-minute hardening window gives Pro Seal RTV users a defined early working period before the compound begins to set. This black, oil-resistant silicone also replaces gaskets, seals, and dressings, making it a candidate for gasket-style drain-plug repairs.

The listed temperature range is -75°F to 500°F, offering a clear boundary for matching the sealant to operating conditions. Its oil resistance is relevant around engine-fluid exposure, while sensor-safe labeling supports use near sensitive components. The nozzle helps direct the compound during application, and the stated 24-hour full cure means the repair schedule should account for a longer wait than the initial hardening window. The supplied facts identify it as RTV silicone, not a thread-specific sealant.

Skip it if you need a thread sealant for fitting threads rather than gasket replacement; LOCTITE 565 is specifically a thread sealant.

Pro Seal fits buyers replacing a gasket or dressing with oil-resistant RTV and who can allow the stated full-cure time. Check that a formed gasket seal is appropriate for the drain-plug arrangement before applying it.

Listed on Amazon as: Pro Seal RTV Silicone Sealant,3 oz Tube,Black (80046)

#7

7. Visbella High Temp RTV

• Material Type: Silicone
• Form: Gel

Best for: Flexible high-temperature silicone.

Why it ranks #7: This RTV is described as oil resistant, waterproof, and flexible, but the supplied listing provides no specific drain-plug or thread-sealing application.

Visbella combines high-temperature resistance with cured elasticity, giving this RTV silicone gasket maker a flexible sealing approach for automotive engine parts. Its waterproof and oil-resistant claims suit buyers considering a formed seal around oil-exposed components, rather than a product specifically described for plug threads.

The silicone is described as waterproof and oil resistant, with resistance to aging and corrosion, features relevant to a seal exposed to fluids and changing conditions. Its flexibility and ability to return to its original state after stretching support movement without treating the compound as a rigid joint. The one-component RTV cures through exposure to air. Instructions call for cleaning oil stains before application, so surface preparation is part of the repair workflow.

Skip it if you require a stated operating-temperature rating before choosing; J-B Weld 31314 Hi-Temp Red specifies continuous temperatures up to 650°F.

Visbella suits buyers seeking flexible, waterproof, oil-resistant RTV for automotive engine-part sealing, provided the application matches its unspecified temperature range. Clean oil from the surface as directed, and use it as gasket material rather than assuming a thread-sealant role.

Listed on Amazon as: Visbella High Temperature RTV Silicone Gasket Maker, Sealed Oil Resistant Waterproof Quick Dry Liquid for Bonding Internal Combustion, Steam Turbines, Automotive Engine Parts 3.7OZ (Black)

#8 · Highest Heat Range

8. J-B Weld Hi-Temp Red RTV

• Weight: 0.3 kg
• Material Type: Silicone
• Form: Paste

Best for: High-heat automotive gasket maker.

Why it ranks #8: Its stated continuous-temperature suitability reaches 650°F, but this RTV gasket maker is less directly suited to sealing drain-plug threads.

Continuous-temperature capability up to 650°F distinguishes J-B Weld Hi-Temp Red for hotter mechanical assemblies. The moisture-cured RTV forms a tough, waterproof seal on most surfaces, making it a gasket-maker choice for oil pans and other automotive joints rather than a dedicated thread sealant.

The stated continuous-temperature limit helps buyers assess whether the application involves higher sustained heat, while the cured silicone resists shrinkage and cracking. Its waterproof seal and resistance to weathering support use in exposed automotive assemblies. The product is specifically noted for oil pans and valve covers, connecting it to engine sealing work. Because it cures when exposed to moisture in air, installation timing and exposure during cure matter; its facts do not identify it as a thread sealant for plug threads.

Skip it if you need a black RTV for gasket work; LOCTITE Automotive RTV Silicone Gasket Maker Black 598 is listed in black.

J-B Weld Hi-Temp Red suits buyers forming automotive gaskets where sustained high heat is the key concern. Its stated examples include oil pans, but a drain plug sealed at its threads calls for a different repair approach.

Listed on Amazon as: J-B Weld 31314 Red High Temperature RTV Silicone Gasket Maker and Sealant – 3 oz. – 2-Pack

#9

9. LOCBONDSO Black RTV

• Weight: 3 oz
• Material Type: High Temp Silicone
• Form: Paste

Best for: Flexible oil-resistant RTV sealing.

Why it ranks #9: This sensor-safe RTV resists oil and water and is rated from -76°F to 600°F, but the listing does not identify a drain-plug thread use.

LOCBONDSO lists resistance to temperatures from -76°F to 600°F, giving buyers a broad stated operating range for this black RTV silicone. Its oil-resistant, sensor-safe formula and retained flexibility point to gasket-making around automotive components rather than dedicated sealing of plug threads.

Resistance to oil, water, and antifreeze supports use where several fluids may contact a formed seal. The one-component silicone cures at room temperature and remains flexible, which can simplify application without a separate curing component while preserving a flexible gasket layer. Its 600°F upper limit and -76°F lower limit provide application boundaries. Storage is specified between 8°C and 28°C, away from water or moisture, so keeping the tube within those conditions matters before use.

Skip it if you need a dedicated thread-sealing compound with repositioning time; Permatex 59214 High Temperature Thread Sealant lists both threaded-fitting use and that feature.

LOCBONDSO suits buyers wanting flexible, sensor-safe RTV for fluid-exposed automotive gasket work within its stated temperature range. Store it within the specified 8°C to 28°C range, and ensure a gasket-maker format suits the drain-plug seal.

Listed on Amazon as: LOCBONDSO Black RTV Silicone Sealant, High Temp Silicone Gasket Maker, 3 oz

#10

10. 1DFAUL RTV Gasket Maker

• Material Type: Silicone
• Form: Liquid, Patch, Strip

Best for: Large-volume engine gasket sealing.

Why it ranks #10: It is an oil-resistant automotive RTV for forming gasket layers, but the supplied facts do not establish suitability for sealing plug threads.

At 170 g, 1DFAUL offers a larger stated quantity than the small tubes in this roundup, useful when an engine repair involves more than one sealing surface. Its oil-resistant, high-temperature RTV forms a flexible gasket and is listed for engines, gearboxes, axles, and pumps.

The sealant is described as forming a uniform, continuous thin layer that fills small surface depressions, supporting gasket-style sealing across mating faces. It is also said not to shrink or crack under high temperature, cold, pressure, or vibration, helping maintain flexibility across changing conditions. The listed applications include engines, gearboxes, front and rear axles, and pump superchargers. These are broad gasket claims; the supplied information does not identify this as a dedicated threaded-plug sealant.

Skip it if you need a numeric temperature limit to compare against an application; J-B Weld 31314 Hi-Temp Red specifies up to 650°F continuous.

Consider 1DFAUL for buyers applying flexible, oil-resistant RTV across engine or drivetrain mating surfaces and wanting a 170 g tube. Its temperature limit is not quantified in the supplied facts, and it is not specified as thread sealant.

Listed on Amazon as: 1DFAUL RTV Silicone Gasket Maker, High Temp Silicone Resist Oil, Black,170g