The automatic transmission in most 2004 Infiniti G35 models uses Dexron III/Mercon automatic transmission fluid, while any manual-transmission version requires a GL-4 gear oil (typically 75W-90). The exact specification can vary by transmission type and market, so it’s best to verify with your owner's manual or dealer for your VIN.
Transmission options and fluid requirements
In 2004, the G35 primarily came with a 5-speed automatic transmission (the RE5R05A). A 6-speed manual option was available on certain configurations. The correct fluid depends on which transmission your car has.
Automatic transmission fluid specification
For the common 5‑speed automatic used in the 2004 G35, Infiniti/Nissan historically recommended Dexron III/Mercon ATF. Dexron VI is backward compatible with Dexron III and is widely used in newer vehicles, but you should confirm compatibility for your specific VIN with the owner's manual or a dealer.
- Dexron III/Mercon ATF is the traditional specification for the 5-speed automatic (RE5R05A) in most 2004 G35 models.
- Dexron VI is backward compatible with Dexron III and is commonly accepted as an alternative where approved for your VIN; verify with the manual or dealer.
- When selecting a fluid, choose one labeled Dexron III/Mercon (or Dexron VI if your VIN/manual approves it) and avoid fluids not meeting those specs.
In summary, use ATF that meets the Dexron III/Mercon specification for the automatic transmission; Dexron VI can be acceptable if your manual allows it for your VIN.
Manual transmission fluid specification
If your 2004 G35 is equipped with the 6-speed manual, use a GL-4 rated gear oil (typically 75W-90 synthetic). Do not use automatic transmission fluid in the manual transmission, as it can damage gears and synchronizers.
- Fluid type: 75W-90 GL-4 synthetic gear oil for the manual transmission.
- Brand considerations: Mobil 1 75W-90, Royal Purple Max Gear 75W-90, Red Line MT-90, or other fluids that meet GL-4 requirements.
- Important caveat: Avoid GL-5 gear oils unless the manual specifically calls for GL-5 compatibility, as GL-5 can affect synchronizers in some older manuals.
In brief, manual transmissions in the G35 require GL-4 75W-90 gear oil, not ATF, with attention to brand compatibility and the vehicle’s specific manual requirements.
Practical maintenance notes
Always verify the exact specification for your VIN, as fluid approvals can vary by production date or market. If in doubt, consult the owner’s manual or contact an Infiniti dealer. Use high-quality fluids from reputable brands and avoid mixing different ATFs or gear oils unless explicitly allowed by Infiniti. When servicing, follow the recommended intervals in your manual and ensure proper level checks with the correct equipment.
Summary: For the 2004 Infiniti G35, automatic transmissions typically require Dexron III/Mercon ATF (with Dexron VI acceptable if approved for your VIN/manual); manual transmissions require GL-4 75W-90 gear oil. Always confirm the exact specification for your vehicle’s VIN and trim with the owner’s manual or a dealer.
Can low transmission fluid cause stuttering?
If shuddering occurs primarily between 30-45 mph, this suggests torque converter problems related to low fluid levels. This specific speed range often reveals transmission issues that might not be noticeable at other speeds.
What transmission fluid does a 2004 Infiniti G35 take?
FRAM – Dexron III / Mercon Multi-Vehicle Automatic Transmission Fluid: 1 Quart (Part No. F420)
What kind of transmission fluid does an Infiniti take?
ATF Type S is formulated for Nissan and Infiniti models to match their exacting specifications for Matic-S, J and D transmissions. Idemitsu ATF transmission fluids are factory-fill quality products engineered to meet the most stringent requirements of Nissan and Infiniti.
What's the best transmission oil for Infiniti G35?
- Red Line Oil Full Synthetic 75W-140. Customize.
- Red Line MT-90 75W90 Full Synthetic GL-4 Gear Oil 1 Quart. Customize.
- Red Line MT-85 75W85 Full Synthetic GL-4 Gear Oil 1 Quart. Customize.
- Ultra1Plus U1P-Drive Manual Transmission Fluid UCDIIIMMPD. Customize.
- Red Line Oil Manual Transmission Fluid 58304. Customize.