CarCareTruth Score
Decent.
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Prices may varyHealth score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
No Safety Data Sheet on file.
CarCareTruth has not received a Safety Data Sheet from the manufacturer for this product. Hazard classification and PPE cannot be cited. Request an SDS from the manufacturer before use.
This product ranks #7 of 8 in Dielectric Grease.Three above it ↓
Last reviewed June 14, 2026
TL;DR Solid protection for spark plug boots and trailer connectors in a brush-top can that cuts down on mess. Bristles soften with heavy use, and no SDS means the health score is a data-gap placeholder.
This grease seals spark plug boots, trailer connectors, and battery terminals against moisture and corrosion. Twist off the lid to expose a built-in brush, dab onto pin contacts or the boot interior, and reassemble. owners confirm the paste stays put without migrating. The manufacturer rates service from −40°F to 400°F, adequate for underhood and trailer use. The packaging caveat: owners noted bristle softening after repeat use and switched to cotton swabs. The grease itself performs normally.
Good fit for anyone doing spark plug service or trailer connector maintenance who wants a built-in applicator. The 4oz can suits multiple vehicles or service intervals. Skip it if you need single-use packets for a one-off job · a 3g packet from a known brand costs less and sidesteps the Add-On cart requirement.
No SDS is on file. Silicone paste chemistry carries no vapor at application temperatures; skin and incidental eye contact are the realistic exposure routes. Silicone polymers are not readily biodegradable, but the leave-on application and 0% VOC formulation limit direct environmental release.
Yes · this product ships as part of Amazon's Add-On program, which means it can only be purchased alongside other qualifying items to reach a minimum cart threshold. If you're ordering just this item, pair it with another auto supply to qualify.
CarCareTruth applies a health score of 5.0 whenever no Safety Data Sheet is available · it reflects a data gap, not a confirmed hazard. The inferred silicone base chemistry suggests a low-risk product. If 4LifetimeLines publishes an SDS, the health score will be recalculated.
Yes. A thin coat on the inside of the boot prevents it from fusing to the plug over time and seals out moisture at the connection. Apply a small amount to the boot interior and the plug base · not on the plug threads or electrode.
Marketing copy from 4LifetimeLines, via Amazon. Not editorial.
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