Idemitsu ATF Type HK4 Automatic Transmission Fluid for Hyundai & Kia — 6 x 1 qt, anti-shudder & oxidation-resistant

Idemitsu ATF Type HK4 is a manufacturer-compatible automatic transmission fluid formulated specifically for Hyundai and Kia automatic transmissions, supplied here as six 1-quart bottles.

This ATF matches the friction and sealing requirements of many Hyundai and Kia gearboxes that call for Type HK4, delivering smoother shifts, improved seal conditioning and resistance to oxidation. It is engineered to avoid shudder and help maintain transmission cleanliness and component life under normal driving conditions. Note: this product is not intended for use in CVT or DCT transmissions.

Which vehicles and transmissions is this fluid compatible with?

Idemitsu Type HK4 is designed to meet the specifications used by Hyundai and Kia for select automatic transmissions that require HK4-grade fluid. Before pouring, always check the vehicle owner’s manual or transmission dipstick specification to confirm compatibility.

• Formulated to match Hyundai and Kia HK4 requirements for compatible automatic gearboxes
• Sold as six 1-quart bottles for multiple changes or service kits
• Not suitable for continuously variable transmissions (CVT) or dual-clutch transmissions (DCT)

How does this ATF support smoother shifting and anti-shudder performance?

The fluid’s frictional characteristics are precisely engineered to provide consistent clutch engagement and slip behavior under varying temperatures. That helps minimize shudder during torque transfer and gives predictable, quiet shifts throughout normal driving cycles.

• Advanced friction control for consistent clutch bite and release
• Designed to reduce transmission shudder under load
• Stable performance across typical operating temperatures

What protection and longevity benefits does Idemitsu Type HK4 provide?

This formulation resists oxidation and thermal breakdown, which helps maintain fluid properties and reduces sludge and varnish buildup inside valve bodies and torque converters. It also contains anti-wear additives to protect gear surfaces and bearings, extending component life when used as specified.

• Oxidation-resistant base for longer fluid life and stable viscosity
• Anti-wear chemistry to protect gears, clutch packs, and bearings
• Cleaner formulation to reduce deposits and keep hydraulic passages clear

Will this fluid affect seals or cause leaks?

Idemitsu Type HK4 includes seal-conditioning ingredients to maintain flexibility and reduce shrinkage that can lead to leaks. Proper seal compatibility helps preserve gasket and O-ring integrity over repeated service intervals when the correct fluid is used.

• Seal conditioners to help prevent hardening and cracking
• Reduces risk of leakage caused by aged seals when compatible with OEM specs
• Recommended replacement intervals and OEM checks still apply

Who is this for: This six-quart pack is tailored for DIY mechanics, independent shops and fleet operators who service Hyundai and Kia automatics that require HK4 fluid. It’s ideal when you need multiple quarts for a full drain-and-fill, transmission service kit, or to keep on hand for routine maintenance. Confirm your vehicle’s specified ATF type before use; do not use this product in CVT or DCT gearboxes.