Mobil Mobil 3309 Automatic Transmission Fluid JWS 3309 - 6 x 1 Quart, Synthetic ATF for Smooth Shifting & Seal Compatibility

Mobil 3309 Automatic Transmission Fluid is a high-performance ATF formulated to meet JWS 3309 and equivalent OEM specifications for smooth shifting, seal compatibility, and long-term viscosity stability.

Mobil 3309 ATF is designed for use in certain slip-controlled, lock-up automatic transmissions where manufacturers call for JWS 3309, GM 9986195, Toyota T-IV/T-III equivalence, or similar specifications. Packaged here as six 1‑quart bottles, this fluid aims to maintain stable viscosity across temperature extremes, resist chemical breakdown, and protect moving parts against wear and corrosion. It also works with modern synthetic rubber seals and resists foaming, helping transmissions stay quiet and responsive under a range of driving conditions.

Which transmissions is Mobil 3309 compatible with?

Mobil 3309 is recommended where OEMs specify JWS 3309 or equivalent service levels and it is compatible with several manufacturer fluid standards. Always check your vehicle’s owner manual or transmission data plate to confirm the recommended fluid specification before use.

• Recommended for JWS 3309 and GM 9986195 service levels.
• Compatible with Toyota T-IV (T4) and T-III (T3) type specifications.
• Meets or is compatible with certain Ford and VW transmission requirements where specified.

How does this ATF support transmission performance?

Mobil 3309 helps preserve transmission operation through a combination of thermal and chemical stability, controlled frictional properties, and corrosion protection. This supports quiet gearing, consistent shift feel, and longer component life under varied temperatures and loads.

• High viscosity index reduces thinning at high temperatures and excessive thickening when cold.
• Formulated to resist oxidation and chemical breakdown for longer fluid life.
• Friction characteristics tuned for smooth, predictable gear engagement.
• Anti-corrosion additives help prevent rust on internal parts.

Will Mobil 3309 work with seals and modern materials in my transmission?

Yes — the formula is compatible with many synthetic rubber seal compounds used in modern automatic transmissions. That compatibility helps prevent leaks and maintains proper hydraulic control within the gearbox.

• Safe for common elastomers used in OEM transmissions.
• Designed to minimize swelling, shrinkage, or hardening of seals over time.
• Foam-resistant formulation maintains consistent hydraulic response.

What are the practical benefits of buying the 6-quart case?

Purchasing a case of six 1‑quart bottles gives you spare fluid for routine service intervals, easier top-ups, and cost savings versus single-bottle purchases. It’s convenient for DIY maintenance, shop use, or keeping a ready supply for multiple vehicles.

• Six individual 1‑quart bottles for controlled pouring and storage.
• Good for multiple services or stocking for future top-ups.
• Reduces the need to open and store part-used larger containers.

Who is this for: Mobil 3309 ATF in a case of six 1‑quart bottles is aimed at vehicle owners and professional technicians who need a trusted fluid that matches JWS 3309 and similar OEM requirements. It’s suited to drivers seeking a stable, seal‑friendly ATF for transmissions that call for these specifications, plus small garages and fleets that benefit from buying a multi-bottle pack for service convenience.