Idemitsu ATF Type HK Automatic Transmission Fluid 5-Quart — Hyundai/Kia SP-III, Anti-Oxidation & Seal Protection

Idemitsu ATF Type HK is a 5-quart automatic transmission fluid blended to meet Hyundai/Kia SP-III requirements and deliver smoother shifts, improved seal protection, and longer transmission life.

Specifically engineered for vehicles that require the SP-III specification, this Idemitsu ATF Type HK (part number 30040097-95300C020) comes in a 5-quart container to support full-service changes or top-ups. It was formulated to resist thermal breakdown and oxidation while keeping frictional properties stable under a range of driving conditions. The result is predictable gear engagement, reduced deposit formation, and better protection for bearings, seals, and clutch components.

What performance benefits can I expect from this ATF?

Idemitsu Type HK focuses on maintaining consistent friction and protecting internal parts so shifting stays smooth and responsive. It helps limit sludge and varnish build-up that can interfere with valve bodies and clutch packs.

• Stable friction characteristics for crisp, consistent gear engagement
• Anti-oxidation chemistry to reduce sludge and varnish formation
• Improved seal conditioning to minimize leaks
• Enhanced wear protection for bearings and gear surfaces

Is this fluid compatible with my Hyundai or Kia vehicle?

This product is engineered to meet the SP-III specification required by many Hyundai and Kia automatic transmissions. Always check your owner's manual or service sticker to confirm SP-III compatibility before use.

• Formulated to the Hyundai/Kia SP-III performance profile
• Suitable for many OEM-specified automatic gearboxes that list SP-III
• Designed to work with common seals, gaskets, and clutch pack materials
• Not a universal replacement for non-SP-III transmissions—verify application

How does using Idemitsu ATF Type HK affect maintenance intervals?

By resisting oxidation and thermal breakdown, the fluid helps maintain fluid integrity for longer, potentially supporting recommended service intervals. However, follow the interval guidance from your vehicle manufacturer, since driving habits and conditions influence fluid life.

• Oxidation resistance helps preserve fluid properties between services
• Reduced deposit formation supports consistent hydraulic performance
• Regular checks of fluid level and condition are still recommended
• Use OEM service intervals as the definitive maintenance schedule

How should I use this 5-quart container for service?

The 5-quart size is convenient for a complete drain-and-fill on many passenger cars and SUVs, or for partial top-ups during routine checks. Follow proper drain, flush, and refill procedures, and dispose of used fluid responsibly.

• One container often covers a full fill for smaller transmissions or a partial service for larger ones
• Perform a clean drain and consider a pan cleaning to remove settled deposits
• Check the fill level at operating temperature per vehicle instructions
• Recycle used fluid at an approved facility

Who is this for? Drivers and technicians who own or service Hyundai and Kia vehicles requiring the SP-III automatic transmission fluid will find Idemitsu ATF Type HK useful. It’s aimed at those seeking a stable, OEM-compatible fluid to support smooth shifting, reduce internal deposits, and protect seals and components over typical driving conditions. Ideal for DIYers performing scheduled maintenance and professional shops that need a reliable SP-III option in a convenient 5-quart package.