{"product_id":"idemitsu-atf-type-hk-automatic-transmission-fluid-5-quart-sp-iii-spec-smoother-shifting-thermal-stability","title":"Idemitsu ATF Type HK Automatic Transmission Fluid 5-Quart — SP-III Spec, Smoother Shifting \u0026 Thermal Stability","description":"\u003cp\u003e\u003cstrong\u003eIdemitsu ATF Type HK is a 5-quart automatic transmission fluid formulated to meet Hyundai\/Kia SP-III requirements and deliver smoother shifting, improved seal compatibility, and thermal stability for modern automatic transmissions.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis 5-quart container of Idemitsu ATF Type HK (part number 30040097-95300C020) is designed specifically for transmissions that require the SP-III specification used by many Hyundai and Kia vehicles. The formula focuses on oxidation resistance, seal conditioning, and minimizing sludge or varnish buildup to help transmissions operate consistently under city and highway driving.\u003c\/p\u003e\n\n\u003ch3\u003eWhat benefits does Idemitsu ATF Type HK provide for automatic transmissions?\u003c\/h3\u003e\n\u003cp\u003eIdemitsu ATF Type HK supports reliable shifting, reduces wear on clutch packs and gears, and helps preserve transmission internals by resisting breakdown at high temperatures. While it doesn’t replace scheduled service, using the correct ATF specification helps maintain performance and reduces the chance of fluid-related issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSmoother shift feel for predictable gear changes\u003c\/li\u003e\n  \u003cli\u003eOxidation and thermal stability to slow fluid degradation\u003c\/li\u003e\n  \u003cli\u003eSeal compatibility to limit leaks and preserve gasket life\u003c\/li\u003e\n  \u003cli\u003eFormulation that reduces sludge and varnish formation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I know this ATF is right for my Hyundai or Kia?\u003c\/h3\u003e\n\u003cp\u003eCheck your vehicle owner’s manual or the transmission filler cap for the SP-III (or equivalent) specification requirement. This Idemitsu ATF Type HK is produced to meet those SP-III performance targets, making it suitable for models that list that specification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm the manual lists SP-III or the equivalent spec\u003c\/li\u003e\n  \u003cli\u003eUse the correct quantity and service interval recommended by manufacturer\u003c\/li\u003e\n  \u003cli\u003eWhen in doubt, match fluid part numbers or consult a technician\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this fluid affect maintenance and transmission life?\u003c\/h3\u003e\n\u003cp\u003eWhile no fluid can eliminate the need for regular maintenance, an appropriate ATF helps reduce thermal and oxidative stress on transmission components. Consistent use of the correct fluid can decrease deposit formation and protect seals, which supports longer service intervals and fewer repair needs related to fluid failure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduces varnish and sludge that impair clutch operation\u003c\/li\u003e\n  \u003cli\u003eHelps maintain hydraulic properties for reliable pressure control\u003c\/li\u003e\n  \u003cli\u003eSupports seal elasticity to prevent leaks between services\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I mix Idemitsu ATF Type HK with other transmission fluids?\u003c\/h3\u003e\n\u003cp\u003eMixing different ATF formulations is not recommended because additives and friction characteristics vary between brands and specifications. If you must top off and the exact fluid is unavailable, use caution and replace with the correct fluid at the earliest service to avoid potential compatibility or performance issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAvoid mixing unless it’s a short-term emergency measure\u003c\/li\u003e\n  \u003cli\u003ePlan for a proper full fluid exchange with the correct ATF soon after\u003c\/li\u003e\n  \u003cli\u003eConsult service documentation or a professional for compatibility guidance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Idemitsu ATF Type HK 5 quart is aimed at owners and technicians servicing Hyundai and Kia vehicles that specify SP-III automatic transmission fluid. It suits people doing scheduled fluid changes, rebuilds, or top-offs who want an SP-III-grade product with attention to oxidation resistance, seal protection, and shift quality. If you maintain your vehicle according to manufacturer guidance and want a purpose-formulated ATF for SP-III transmissions, this Idemitsu product is a practical choice.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Idemitsu ATF Type HK compatible with all Hyundai and Kia models?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It’s compatible with models that require the SP-III specification; always verify your owner’s manual for the correct ATF spec.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I change this automatic transmission fluid?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Follow your vehicle manufacturer’s service schedule; intervals vary by model, driving conditions, and local recommendations.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Idemitsu","offers":[{"title":"Default Title","offer_id":55169213792599,"sku":"B08CS118HP","price":91.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/idemitsu-atf-type-hk-front-label.jpg?v=1790420794","url":"https:\/\/britishgarage.co.uk\/products\/idemitsu-atf-type-hk-automatic-transmission-fluid-5-quart-sp-iii-spec-smoother-shifting-thermal-stability","provider":"British Garage","version":"1.0","type":"link"}