Idemitsu ATF Type HK4 Automatic Transmission Fluid for Hyundai & Kia — 1 Quart Pack of 6, Smooth Shifting & Anti-Shudder

Idemitsu ATF Type HK4 is a purpose-built automatic transmission fluid engineered to deliver smooth shifts, anti-shudder performance, and long-term protection for Hyundai and Kia automatic gearboxes.

Designed specifically for Hyundai and Kia conventional automatic transmissions, this ATF formulation balances friction, wear protection, and oxidation resistance so your transmission maintains consistent feel and reliability. It is supplied in 1-quart bottles sold as a pack of six to simplify oil changes and top-offs for passenger cars, SUVs, and light trucks that call for Type HK4 fluid. This product is not intended for use in continuously variable transmissions (CVT) or dual-clutch transmissions (DCT).

How does Idemitsu ATF Type HK4 improve shift quality?

Type HK4 is engineered with tight frictional control to stabilize clutch engagement and reduce shuddering during gear changes. That engineered friction profile helps the transmission deliver predictable, smooth shifts across a wide range of temperatures and driving conditions.

• Optimized friction modifiers for consistent engagement feel
• Stable viscosity for reliable hydraulic control
• Reduces shift shock and shudder under load

Will this fluid help extend the life of my transmission?

The formulation provides enhanced anti-wear additives and strong oxidation resistance to limit component wear and fluid degradation over time. Cleaner fluid and protection against varnish and sludge also help keep valve bodies and clutch packs operating as intended.

• Advanced anti-wear chemistry protects gears and bearings
• Oxidation inhibitors slow fluid breakdown at high temperatures
• Detergent and dispersant agents minimize deposits and varnish

Is Idemitsu ATF Type HK4 compatible with my Hyundai or Kia?

This ATF is formulated to meet the specifications called out by many Hyundai and Kia conventional automatic transmissions that require Type HK4 fluid. Always confirm your vehicle’s owner’s manual or service documentation to verify the correct fluid specification before use.

• Meets Hyundai/Kia Type HK4 transmission requirements
• Ideal for models specifying conventional automatic ATF (not CVT/DCT)
• Sold in convenient 1-quart bottles for accurate servicing

How should I store and handle the pack of six 1-quart bottles?

The six-bottle pack keeps spare fluid on hand for scheduled changes and mid-interval top-offs. Store in a cool, dry place away from direct heat and seal bottles tightly after opening to preserve additive integrity.

• Keep bottles upright and capped to prevent contamination
• Store between recommended room temperatures, away from flames
• Use within the manufacturer-recommended shelf life once opened

Who is this for: Drivers and technicians who own Hyundai or Kia vehicles that specify Type HK4 automatic transmission fluid and who want a purpose-formulated product to support smooth shifting, reduce shudder, and protect internal components. It’s suitable for DIY mechanics, independent shops, and fleet maintenance teams looking for OEM-compatible ATF supplied in practical 1-quart bottles sold as a six-pack for multi-service convenience.