CarCareTruth Score
Decent, but it underperforms.
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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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Only when: splash risk · prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS Section 8 calls for safety glasses with side-shields as minimum protection, and tight-fitting goggles or a face-shield if splashes are likely. Section 2 lists no eye-hazard GHS code at the mixture level (Serious eye damage/eye irritation: Not classified), so this is a splash/prolonged-contact precaution during drain-and-fill, not a mixture-level eye hazard.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Especially relevant: splash risk · prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 2
SDS Section 2 classifies this fluid Skin Sens. 1 (H317, may cause an allergic skin reaction) at the mixture level, and Section 8 specifies protective gloves (neoprene or nitrile) and protective clothing, avoiding contaminated clothing leaving the work area. This is a mixture-level classified hazard, warranting a recommended tier rather than situational.
U.S. regulatory standard
29 CFR 1910.138(a); 1910.132(d)
“appropriate hand protection when employees' hands are exposed to hazards such as those from skin absorption of harmful substances.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Only when: in enclosed space · hot panels
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS Section 8 conditions respiratory protection on exposure limits being exceeded or irritation being experienced, recommending NIOSH/MSHA-approved protection in that case. Section 2 carries no inhalation-irritation hazard code at the mixture level (all inhalation acute-toxicity categories are Not classified), so ordinary cold-fluid drain-and-fill with adequate ventilation does not trigger this; elevated-temperature or enclosed-space handling would.
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.
Scope of these PPE tiers. The tiers on this page translate the product's Safety Data Sheet where one is published, plus its ingredient chemistry, into a comparable rating. They describe a formulation, not a situation: a tier is not a safety determination for any specific user, task, quantity, or environment. The manufacturer's label and use instructions govern how the product is handled. Where the product is used at work, the employer's PPE program and hazard assessment under 29 CFR 1910.132 decide what protection is selected, not this page.
No warranties. CarCareTruth makes no warranties, express or implied, and expressly disclaims the implied warranties of merchantability and fitness for a particular purpose.
This product ranks #15 of 18 in Transmission Fluid.Three above it ↓
Last reviewed August 26, 2026
TL;DR Idemitsu ATF Type H-Plus targets Honda and Acura automatics specifying ATF Z-1 or DW-1. Idemitsu is Honda's actual contracted maker of genuine DW-1, but this is Idemitsu's own separately branded fluid, and independent lab analysis shows a different additive package. Owners report smooth, shudder-free shifting. Wear neoprene or nitrile gloves; the SDS rates it Warning for a skin sensitizer.
Idemitsu is Honda's actual contracted manufacturer for ATF DW-1, the fluid that ships in the Honda-branded bottle. Type H-Plus ships under Idemitsu's own name instead, and independent oil-analysis testing shows its additive package differs from the genuine fluid; Idemitsu has acknowledged this while maintaining it still meets DW-1 and Z-1 performance targets. A drain-and-fill is straightforward for a first-timer. Honda and Acura owner forums report smooth shifting with no shudder or seal complaints found.
The fit is Honda and Acura owners who want a fluid from a credentialed source other than the Honda-branded bottle, and who accept a manufacturer compatibility claim over a verified OEM license. Buyers wanting the guaranteed genuine article should choose Honda-branded DW-1 instead. CVT-equipped Hondas need a different fluid; check your owner's manual.
The SDS classifies this fluid Warning for a skin-sensitizer additive (H317); wear neoprene or nitrile gloves for a drain-and-fill. A California Prop 65 warning applies from trace benzene disclosed in the SDS itself, though the Amazon listing carries none. Not classified aquatic-hazardous at the mixture level; take spent fluid to a used-oil facility, not a drain.
Not exactly. Idemitsu is the company Honda actually contracts to manufacture genuine DW-1, but Type H-Plus is Idemitsu's own separately branded retail product, not the Honda-labeled bottle. Independent oil-analysis testing comparing the two shows a different additive package, and Idemitsu itself has acknowledged that difference while maintaining Type H-Plus still meets DW-1's performance requirements.
Idemitsu markets Type H-Plus as compatible with both the older Z-1 spec and the newer DW-1 spec, letting one bottle cover a wider range of Honda and Acura model years. No independent third-party test data was found confirming the Z-1-era compatibility claim beyond the manufacturer's own labeling, so treat it as a manufacturer claim rather than an independently verified one.
Yes. Even though the Amazon listing doesn't post a Prop 65 notice, the product's own Safety Data Sheet discloses trace benzene, a listed carcinogen and reproductive toxicant, at under 0.001% by weight in Section 15. That direct manufacturer disclosure is why this page shows a Prop 65 warning despite the retail listing showing none.
The SDS classifies Type H-Plus Warning for a skin-sensitizer hazard from one of its additives, and recommends neoprene or nitrile gloves for handling. Safety glasses with side shields are the baseline eye protection, with goggles or a face shield if splashing is likely. Respiratory protection isn't needed for a normal cold drain-and-fill with adequate ventilation.
Owner reports across Honda and Acura forums describe smooth, consistent shifting after switching to Type H-Plus, with no shudder or seal complaints found, including at least one long-term comparison rating its shift feel on par with genuine DW-1. That's community experience, not an independent lab test, so results can vary by vehicle and transmission condition.
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