Permatex Ultra Black RTV Silicone Gasket Maker Pack of 12 — 3.35 oz Tubes, Oil-Resistant & Sensor-Safe

Permatex Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker is a sensor-safe, oil-resistant silicone sealant designed to form flexible, durable gaskets for engines and drivetrains.

This fast-curing RTV silicone from Permatex creates dependable, OE-level gasket seals that resist oil, shop fluids and vibration while remaining safe for sensors and non-corrosive to metal surfaces. Engineered with a patented adhesion system, the formula maintains flexibility across a broad temperature span and helps meet extended drivetrain warranty requirements. The product ships in convenient 3.35 oz tubes; this listing is a pack of 12 tubes for shops, fleets or heavy DIY use.

How does this gasket maker handle high temperatures and engine fluids?

The silicone compound withstands extreme conditions without hardening or breaking down, preserving a reliable seal under heat and exposure to automotive fluids. It’s formulated to remain stable across a wide temperature window to protect seals in varied operating environments.

• Intermittent temperature tolerance up to 500°F (listed spec up to 550°F in some materials)
• Resists motor oil, transmission fluid and common shop chemicals
• Maintains elasticity to reduce leak risk under thermal cycling
• Prevents gasket creep and preserves torque retention on fasteners

Is this safe to use around modern engine sensors and aluminum parts?

Yes — the formula cures with low odor and is non-corrosive, minimizing risk to delicate sensors and lightweight metals. Permatex specifically designed Ultra Black to work with contemporary materials used in OEM components and service replacements.

• Sensor-safe chemistry to avoid interference with oxygen or other engine sensors
• Non-corrosive, so it won’t damage aluminum, bi-metal alloys or plated surfaces
• Compatible with high-tech plastics commonly found in modern engines
• Useful for applications where dealerships or manufacturers require OEM-level products

What common automotive jobs is this gasket maker recommended for?

Permatex Ultra Black is suited for many sealing tasks where oil resistance and flexibility matter. It serves well on a variety of engine and drivetrain joints where a formed gasket or sealant is preferred over pre-cut gaskets.

• Valve cover and oil pan rTV gaskets
• Intake manifold end seals and timing cover seals
• Transmission pan sealing and differential cover repairs
• Service and repair situations demanding OEM-spec performance

How do I apply and cure this RTV for best results?

Preparation and correct application are key: surfaces should be clean, dry and free of old gasket material or oil. Apply a continuous bead, allow the product to skin over, then reassemble per vehicle torque specs; cure time varies by bead thickness and environmental conditions.

• Clean mating surfaces thoroughly; remove old sealant and contaminants
• Apply an even bead; follow manufacturer torque and reassembly guidance
• Allow adequate cure time before pressurizing or filling with fluids
• Store tubes upright and cap when not in use to extend shelf life

Who this is for: Permatex Ultra Black 3.35 oz tubes (pack of 12) suit professional mechanics, independent repair shops, fleet maintenance teams and committed DIYers who need a reliable, sensor-safe oil-resistant gasket maker in bulk. Choose this pack when you want consistent, OEM-level sealing performance across multiple service jobs without frequently reordering single tubes.