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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.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
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From the manufacturer’s Safety Data Sheet, Section 8
“SDS §8 states 'None required for consumer use.' No H318/H319 in §2. Label caution says 'Avoid contact with eyes' · consumer-label language without GHS classification basis. Situational for splash-risk scenarios only.”
— AGS
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §8 states 'No special protective equipment required.' No H315/H317 in §2. Situational for prolonged or repeated exposure.”
— AGS
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“No inhalation H-codes in §2. Silicone paste is non-volatile (flash point 149°C). Situational is the minimum valid tier for chemical products per health.md.”
— AGS
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
This product ranks #2 of 9 in Dielectric Grease.
Last reviewed June 9, 2026
TL;DR Reliable protection for spark plug boots, trailer connectors, and battery terminals, with label-confirmed operation to 400°F (204°C). The 4 oz tube handles most home service tasks well; a syringe format would give finer control on multi-pin connectors.
AGS DS-4 is a silicone paste that seals moisture and corrosion from connector pins, spark plug boots, and battery terminals. A thin coat inside a plug boot keeps the rubber from fusing to the plug; a dab on each pin prevents oxidation. AGS rates it from -40°F to +400°F · adequate for underhood locations near exhaust sensors. Community feedback is strong and well-rated across a large owner base on Amazon; AGS has produced dielectric compounds in Michigan since 1931.
Best for DIY owners doing spark plug service, maintaining trailer connections, or protecting battery terminals in wet or salt-belt conditions. The 4 oz tube is a solid fit for regular service intervals. Skip it if you only need to cover one connector once · a 3 g single-use packet costs less.
The SDS shows no GHS hazard classifications · no signal word, no H-codes, no PPE indicated by the chemistry. The silicone base is non-volatile at ambient temperatures, so no inhalation pathway exists. PDMS is not readily biodegradable, but gram-level leave-on use in connectors leaves a minimal environmental footprint.
Yes · the product label specifically calls out spark plug boots as a primary use case. Silicone-based dielectric greases are broadly compatible with the EPDM rubber used in modern OEM plug boots.
No. The SDS (rev. 2019-03-29) explicitly states 'This product does not contain any Proposition 65 chemicals.' The product listing flags Prop 65, but this is inconsistent with the manufacturer's SDS.
The product label states an operating range of -40°F to +400°F (-40°C to +204°C), covering typical underhood temperatures including sensors near exhaust systems.
Yes · battery terminals are explicitly listed on the product label. A thin coat on the terminal post and cable end protects against corrosion and oxidation.
No. AGS DS-4 is silicone-based, not petroleum-based. Petroleum greases can degrade rubber components over time; silicone is the correct choice for rubber boot protection and high-heat ignition applications.
Marketing copy from AGS, via Amazon. Not editorial.
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