Mission Automotive Silicone Dielectric Grease Paste, 8 oz

Mission Automotive's silicone paste ships in a wide-mouth jar with a brush applicator built into the lid — a practical format for applying a thin, even coat inside spark plug boots, on trailer plug pins, or across caliper slide pins. The paste stays put without migrating, and the label claims stable consistency from -55°F to 570°F. With 5,000+ reviews at 4.8 stars and a #14 rank in Automotive Electrical Greases, the community validation is unusually strong for an Amazon-native brand. Verified purchasers report clean, corrosion-free terminals on long-term re-inspection.

Best for anyone doing a spark plug service, maintaining trailer connectors through salt-belt seasons, or protecting battery terminals in a wet climate. The jar-with-brush format handles multiple connectors per session without waste. Skip it if you need a single-use dab — a 3 g generic packet does the same job for less. Also skip if your application requires a documented dielectric strength figure (hybrid or EV high-voltage connectors specifically).

No safety data sheet is on file. The label identifies the product as silicone paste meeting MIL-S-38660C and NSF H-1 specifications — chemistry consistent with polydimethylsiloxane, which is non-volatile and not classified as an aquatic toxicant. The leave-on pathway means the product stays on connectors rather than reaching storm drains. The health score of 3.0 reflects the no-SDS penalty, not a confirmed chemical hazard.