The 2003 Infiniti i35 uses SAE 5W-30 motor oil, and the engine holds about 5.1 quarts with a filter.
For the i35’s 3.5-liter V6 (the VQ35DE), you can run conventional 5W-30 or upgrade to a synthetic 5W-30 for improved protection and longer drain intervals. Always verify the exact specification on the vehicle’s under-hood sticker or in the owner’s manual, since climate and driving style can influence the recommended grade.
Oil specifications and capacity
Key details you should know about viscosity, type, and capacity are listed below.
- Viscosity: SAE 5W-30
- Oil type: conventional or synthetic; synthetic is recommended for longer intervals and enhanced protection
- Oil capacity: approximately 5.1 quarts with a new filter
- Specs to meet: use an oil that meets API service requirements for gasoline engines and ILSAC standards (e.g., API SN or newer; ILSAC GF-5 or newer, depending on availability)
When in doubt, consult the owner's manual or a trusted service professional for the exact specification for your climate and driving conditions.
Maintenance and change intervals
Regular oil changes are essential to keep the V6 running smoothly. Consider these guidelines when planning maintenance.
- Oil change intervals: about every 3,000–5,000 miles with conventional oil; about every 5,000–7,500 miles (or longer) with synthetic oil, depending on driving conditions
- Always replace the oil filter at each change
- Inspect the drain plug gasket and replace if necessary
- Choose high-quality oil and a compatible filter to maximize protection
Following the manual’s guidance and using a quality oil tailored to your climate helps preserve engine performance and longevity.
Summary
For a 2003 Infiniti i35, use SAE 5W-30 motor oil with an approximate capacity of 5.1 quarts including the filter. Both conventional and synthetic oils are acceptable as long as they meet API/ILSAC specifications, with synthetic offering longer service intervals in many driving conditions. Always refer to the owner’s manual or under-hood label for the exact grade and capacity for your vehicle and climate, and adhere to recommended change intervals for best results.
What kind of oil does a 2003 INFINITI use?
Oil Grade: SJ
| Viscosity: | 10W-30, 10W-40 (Above -18°C) 5W-30 (All TEMPS) - SAE 5W-30 is preferred. |
|---|---|
| Capacity: | 5 quarts (with filter). After refill check oil level. |
| Torque: | 22-29 ft/lbs (Oil Drain Plug) |
What oil do you use for Infiniti i-35?
Valvoline – High Mileage 5W-30 Full Synthetic Engine Oil, Prevents Leaks (Part No. 881169)
Is 5W-30 good for older engines?
5W30 offers better high-temperature protection. It's great for towing, highway driving, or older engines, especially for drivers in Frandor and Lansing who use their vehicles for more than just errands. 5W20 is thinner and generally suited for newer engines that prioritize efficiency.
What oil does a 2003 Infiniti i35 take?
SAE 5W-30
Oil Grade: SL
| Viscosity: | 10W-30 (Above -18°C) 5W-30 (All TEMPS) - SAE 5W-30 is preferred. |
|---|---|
| Capacity: | 4.2 quarts (with filter). After refill check oil level. |
| Torque: | 22-29 ft/lbs (Oil Drain Plug) |