CarCareTruth Score
Recommended.
Opens Amazon in a new tab. No account needed to look.
Saved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
As an Amazon Associate I earn from qualifying purchases. Full disclosure
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.
Show details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“No H319 or H318 in SDS §2 · product is classified non-hazardous. Label reads 'May Cause Eye and Skin Irritation' (precautionary language, not a GHS-level classification). Splash risk during paste transfer or application near face is the relevant trigger.”
— Permatex
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 H315 or H317 in SDS §2 · product is classified non-hazardous. Label precautionary language ('May Cause Eye and Skin Irritation') without a GHS H315 classification. Prolonged or repeated skin contact is the relevant trigger.”
— Permatex
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 SDS §2. Silicone paste is non-volatile · no vapor, no respirable mist under normal application conditions. The enclosed-space trigger applies to the generic scenario, not because the chemistry identifies an inhalation hazard.”
— Permatex
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 #3 of 9 in Dielectric Grease.
Last reviewed June 9, 2026
TL;DR Proven multi-season protection for spark plug boots, trailer connectors, and battery terminals · owners reach for it again and again. Standard tube; use a light touch to avoid over-filling connector pins.
Dab on connector pins and coat the inside of spark plug boots before seating. The paste seals out moisture and prevents pin oxidation; salt-belt buyers who pull trailer connectors each spring report clean separation years later. Stable to 150°C for most underhood locations. Packaging downside: no syringe precision; the tip gums up between uses.
Best for spark plug service, seasonal trailer connector prep, and battery terminal protection in wet or salt-belt climates. Skip it if you need a single-use dab · a 3 g packet covers a one-time job without leftover.
The SDS classifies this product as non-hazardous: no GHS hazard codes, no signal word. No inhalation hazard is classified · silicone paste produces no vapor at application temperatures. Eyes and skin precautions on the label are not backed by a §2 GHS classification (no H315, no H319). The paste stays on connectors with no drain pathway; the silicone polymer is not readily biodegradable but carries no aquatic toxicity classification.
CarCareTruth scores Permatex Dielectric Tune-Up Grease, 3 oz at 7.1 out of 10 on the composite CCT score, with a health sub-score of 8.5/10. The CCT score blends real-world effectiveness, ingredient health impact pulled from the manufacturer's safety sheet, and environmental footprint against a published category rubric. See the methodology link on this page for the full scoring breakdown.
Per the Safety Data Sheet ingredient disclosure: Back label: 'Contains: Polydimethylsiloxane, Silicone dioxide.' SDS §3 lists no ingredients above disclosure thresholds. Boric acid (CAS 10043-35-3) appears in SDS §15 NJ/MA right-to-know registry · trace processing aid, no ingredient file.
Marketing copy from Permatex, via Amazon. Not editorial.
Weekly pick
One product, one safety verdict, every week. No spam.
Loctite
37535 Dielectric Tune-Up Grease
AGS
Dielectric Silicone Grease Compound
CRC
Technician Grade Di-Electric Grease Compound (3.3 oz)
Versachem
Dielectric Connector Grease, 3 oz
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Community
0 postsShare how you use this product
Drop a quick comment or post a full review with photos and a star rating.
Sign in to postNew here? Create a free account.