The 2004 Infiniti I35 uses SAE 5W-30 engine oil, with full synthetic or synthetic-blend options recommended for optimal protection and longer interval periods. The engine’s oil capacity is roughly five quarts with a filter, and you should verify exact specifications in your owner's manual or with a dealer for your climate and driving conditions.
Powered by the 3.5-liter VQ35DE V6, the I35 from this era was designed to run on standard 5W-30 oil grades across a broad temperature range. While 5W-30 is the baseline, climate and driving style can influence the choice of viscosity and change intervals. Use oil that meets Nissan/Infiniti specifications as noted in the manual or on Infiniti’s official guidance.
Recommended oil types and viscosity
Options you can choose from when buying oil for your I35 include these viscosity grades and formats. The following list covers conventional, synthetic blend, and full synthetic options that meet the basic 5W-30 specification.
- Conventional 5W-30 engine oil (budget-friendly option; suitable for normal driving in moderate climates)
- Synthetic-blend 5W-30 engine oil (balance of cost and protection with improved oxidation resistance)
- Full-synthetic 5W-30 engine oil (top-tier protection, ideal for extreme temperatures, heavy use, or high mileage)
In practice, many owners prefer full synthetic 5W-30 for its superior protection and longer life, though synthetic blends are a common compromise. Always ensure the oil meets the vehicle’s specification requirements as listed in the owner's manual or by Infiniti.
Oil capacity and change intervals
The 2004 I35 typically holds about five quarts of oil with a new filter. When performing an oil change, use the correct filter and ensure the engine is warm enough to drain thoroughly. Change intervals vary by oil type and driving conditions: conventional 5W-30 is commonly recommended every 3,000–5,000 miles, while synthetic 5W-30 can often extend to 5,000–7,500 miles, depending on climate and usage. Always follow the maintenance schedule provided in the owner's manual and adjust for your driving environment.
Summary
For a 2004 Infiniti I35 with the VQ35DE engine, the standard oil choice is 5W-30, with a preference for full synthetic for best protection and longevity. The typical capacity is around five quarts with a filter. Always consult the owner’s manual or your local Infiniti service center to confirm the exact specification for your climate and driving habits.