Idemitsu ATF Type H-Plus automatic transmission fluid — 5 Quart, Honda Z-1/DW-1 spec for smooth shifts

Idemitsu ATF Type H-Plus is a transmission fluid formulated to meet Honda/Acura ATF specifications, delivering smooth shifts, extended fluid life, and improved clutch performance in compatible automatic and CVT transmissions.

Designed as a direct-fit lubricant for vehicles calling for Honda ATF Z-1 or DW-1, this 5-quart container supplies enough high-performance fluid for service or top-up needs. The formula balances optimized viscosity with friction modifiers and anti-wear chemistry so it stays stable under heat, protects gears and bearings, and supports fuel-efficient operation compared with older or standard fluids. It’s engineered to serve both newer models and older vehicles that require improved clutch engagement and long-lasting oxidation resistance.

Will this fluid work in my Honda or Acura transmission?

Yes—Idemitsu ATF Type H-Plus is made specifically for applications where Honda ATF Z-1 or DW-1 is required. Always confirm your vehicle’s owner manual or service guide for the exact ATF specification before changing fluids.

• Compatible with Honda/Acura models specifying ATF Z-1 or DW-1
• Suitable for automatic transmissions and certain systems requiring Honda ATF
• Use vehicle documentation to verify fitment
• Not a universal ATF—check if your car uses other OEM fluids

How does this fluid improve shift quality and clutch feel?

The formula incorporates friction control agents that produce consistent, smooth shifts and reliable clutch engagement. Those additives are tuned to match the friction characteristics Honda engineers expect, which reduces shudder and promotes responsive gear changes across a wide temperature range.

• Friction modifiers optimized for Honda-style clutch performance
• Stable viscosity helps ensure consistent hydraulic pressure and shifts
• Minimizes shudder and slipping in clutch packs
• Performs across varied ambient temperatures

How durable is the oil under high heat and long service intervals?

Idemitsu H-Plus uses oxidation-resistant base stocks and thermal-stable additives to reduce breakdown during high-temperature operation. This stability helps the fluid retain protective properties longer, which can extend service intervals and cut maintenance frequency when compared to fluids that deteriorate faster.

• Resists thermal and oxidative degradation at elevated temperatures
• Maintains anti-wear protection for gears and bearings
• Helps preserve performance over extended drain intervals
• Reduces deposit formation that can impair hydraulic function

What practical benefits will I notice after replacing my ATF with this product?

After switching to Idemitsu ATF Type H-Plus, owners often report smoother shifting, reduced transmission noise, and steadier clutch engagement. The anti-wear features and oxidation resistance also contribute to longer fluid life and sustained protection of internal components.

• Smoother, more predictable shift feel
• Lower risk of gear and bearing wear with anti-wear additives
• Extended fluid life and fewer early fluid breakdown issues
• Improved clutch performance for older and newer vehicles

Who is this for? If you own a Honda or Acura that specifies ATF Z-1 or DW-1 and you want a high-stability, anti-wear automatic transmission fluid that supports fuel efficiency and improved clutch feel, Idemitsu ATF Type H-Plus 5 Quart is a practical choice. It suits professional technicians servicing multiple vehicles and DIYers doing full transmission drains, top-ups, or clutch-pack refreshes—provided you confirm compatibility with the vehicle manufacturer’s recommended fluid specification.