Mobil Automatic Transmission Fluid 3309 — 1 Quart Case of 6, stable viscosity and wear protection

This transmission fluid is formulated to match original equipment manufacturer performance levels such as JWS 3309 and GM 9986195 while remaining compatible with Toyota T‑IV and T‑III specifications. Mobil 3309 emphasizes stable viscosity across wide temperatures, resistance to chemical breakdown, and compatibility with common seal materials. The fluid is designed to promote quiet operation, smoother shifts, and protection against wear, rust, and foaming under demanding driving conditions.

Which vehicles and transmissions is Mobil 3309 ATF suitable for?

Mobil 3309 is recommended where manufacturers call for JWS 3309 or GM 9986195 quality levels, and it is compatible with several Toyota specifications (T‑IV/T‑III). It also meets or is compatible with other standards such as Ford WSS‑M2C924‑A and VW TL 52540‑A in applicable applications. Always verify your vehicle’s owner manual or service guide before selecting an ATF.

• Covers transmissions requiring JWS 3309 performance.
• Compatible with GM 9986195 quality levels and Toyota T‑IV/T‑III systems.
• Meets or aligns with select Ford and VW specifications where permitted.
• Suitable for slip‑controlled, lock‑up automatic transmissions specified by OEMs.

How does Mobil 3309 help with temperature extremes and long service life?

The fluid offers a high viscosity index to minimize thinning at high temperatures and thickening at low start‑up temperatures, helping maintain consistent film strength. Additives and base oil selection improve resistance to oxidation and chemical deterioration, extending fluid life and protecting internal parts. That stability reduces the need for premature fluid changes in many operating conditions.

• High viscosity index for stable film under heat and cold starts.
• Formulated to resist oxidation and chemical breakdown.
• Helps preserve lubrication properties over extended intervals.
• Designed to limit degradative deposits that affect shifting performance.

What performance benefits can I expect in daily driving and towing?

Mobil 3309 promotes smoother gear engagement and quieter transmission operation through its lubricity and friction control balance. It also provides wear protection against metal contact and corrosion, which supports reliable service under load or frequent stop‑and‑go conditions. The fluid’s low tendency to foam helps preserve hydraulic control and shift precision when the transmission is working hard.

• Improves shift quality and reduces transmission noise.
• Protects against wear, rust, and corrosion during heavy use.
• Resists foaming to maintain hydraulic consistency.
• Compatible with common synthetic rubber seals to reduce leaks.

Are there compatibility or seal considerations I should know about?

Mobil 3309 was formulated to be compatible with many synthetic rubber seal materials used in modern transmissions, helping reduce leak risk when replacing or topping up fluid. While broadly compatible, always check manufacturer guidance for specific materials and tolerances. Mixing with other ATF types is not recommended unless explicitly allowed by the vehicle maker, as blended fluids can alter performance characteristics.

• Compatible with common synthetic rubber seals to reduce leakage risk.
• Designed to resist foaming for stable hydraulic operation.
• Confirm OEM compatibility before mixing different ATF types.
• Follow vehicle manufacturer recommendations for change intervals and fluid type.

Who is this for? Mobil 3309 ATF in a 1 quart bottle, sold as a case of six, is aimed at professional shops, independent mechanics, fleet operators, and do‑it‑yourself owners who need OEM‑grade fluid for applicable automatic transmissions. Choose this product when your vehicle’s service specs call for JWS 3309, GM 9986195, or Toyota T‑IV/T‑III compatibility and you want a fluid designed for stable viscosity, smooth shifting, and long‑term protection.