Permatex Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker — 3 oz Tubes (12-Pack), Oil & Vibration Resistant

Built for demanding automotive environments, this Ultra Grey RTV from Permatex forms strong, long-lasting gaskets that hold up under heat, oil exposure, and constant engine vibration. Each tube contains 3 ounces of OEM-specified silicone sealant; this listing is for a convenient 12-pack so you have spares for repeated repairs or a busy shop. The compound is non-corrosive, low-odor, and rated for continuous service from -65°F to 500°F (intermittent peaks), making it suitable for many engine sealing needs.

What kinds of repairs is this gasket maker best for?

This silicone is engineered for parts that experience heavy torque and vibration, common on many import engines and high-performance builds. It cures to a rigid seal that resists oil, coolant, and typical workshop fluids, so it’s appropriate where a durable, leak-free joint is required.

• Valve covers and oil pans where constant oil exposure occurs
• Intake manifold end seals and timing covers subject to engine movement
• Water pumps and thermostat housings exposed to coolant and heat
• Applications demanding OEM-level resistance to vibration and fluids

How does it perform under heat and chemical exposure?

Permatex Ultra Grey resists a wide range of shop chemicals and automotive fluids while maintaining its seal across a broad temperature window. It tolerates both very low temperatures and high operating heat, with intermittent spikes up to 500°F.

• Continuous service down to -65°F for cold starts and storage
• Intermittent temperature resistance up to 500°F for hot engine areas
• Formulated to withstand oils, coolants, and common shop solvents

How easy is it to use and cure on the job?

The product dispenses smoothly from a standard 3 oz tube and levels into a uniform bead that cures to a rigid, non-sag seal. Its low-odor, non-corrosive formula reduces unpleasant fumes and minimizes risk to surrounding components during assembly.

• 3 ounce tube size for precise application and reduced waste
• Low-odor formula for a more comfortable shop environment
• Non-corrosive chemistry to protect metal surfaces and sensors

Will this meet OEM requirements and prevent leaks?

Permatex designed this RTV to meet or exceed many manufacturer performance benchmarks for vibration resistance and fluid compatibility. When applied correctly to clean, dry mating surfaces, it forms a hard gasket that resists oil and coolant seepage over time.

• OEM-specified formulation built to industry-quality standards
• Guaranteed leak prevention when used per application directions
• Ideal for assemblies where a rigid, long-lasting seal is required

Who is this for: Permatex Ultra Grey Rigid High-Torque RTV is aimed at professional mechanics, performance tuners, automotive shops, and serious DIYers who work on high-torque or vibration-prone engines. If you need an OEM-grade, leak-resistant gasket maker in bulk—this 12-pack of 3 oz tubes offers reliable coverage for frequent repairs, engine rebuilds, and maintenance projects that demand durable seals.