The Infiniti I35's 3.5-liter V6 typically requires SAE 5W-30 engine oil, ideally a synthetic or high-quality synthetic blend. Use an oil that meets API service standards (SN or newer) and ILSAC GF specifications, and follow your climate and driving style. Always verify with the owner's manual for your specific year and region.
Recommended oil for Infiniti I35
Below are common oil options that satisfy typical Infiniti/Nissan service guidelines for the I35’s VQ35DE engine.
- 5W-30 full synthetic engine oil that meets API SN/SM and ILSAC GF-4 or GF-5 specifications (examples: Mobil 1, Castrol Edge, Valvoline SynPower).
- 5W-30 synthetic-blend engine oil meeting the same API/ILSAC specs as above.
- Conventional 5W-30 engine oil that meets API service requirements (suitable if synthetic options are unavailable, with shorter drain intervals).
Choosing a 5W-30 grade helps ensure reliable cold-start protection and year-round performance for the I35's V6. While higher-performance or newer-spec oils are generally compatible, always confirm compatibility with your exact model year.
Oil-change intervals and maintenance tips
Oil-change intervals vary by oil type and driving conditions. The following ranges reflect common guidance for the I35 with this engine:
- With conventional oil: typically every 3,000–5,000 miles (or every 3–6 months, whichever comes first).
- With synthetic or synthetic-blend oil: commonly around every 5,000–7,500 miles (or every 6–12 months, depending on driving conditions and the oil brand).
Always follow the maintenance schedule printed in your owner's manual for drain intervals and capacity. Use a reputable brand and a documented filter for optimal engine protection.
Climate and service considerations
Cold climates
In colder regions, 5W-30 remains a safe default because it promotes easier startup and smooth oil flow at low temperatures.
Hot climates and heavy use
In very hot environments or under severe driving, sticking with 5W-30 is common, but some technicians may recommend the same grade or a higher-viscosity option if approved by the service manual. Always refer to your owner's manual for any climate-specific recommendations.
Summary
For Infiniti I35 models, use 5W-30 engine oil, ideally synthetic or synthetic blend, that meets API SN/SM and ILSAC GF-4 or GF-5 specifications. Follow the maintenance schedule in your manual, choose a reputable brand and filter, and consult a licensed Infiniti technician or dealer if you’re unsure about the exact specification for your model year and climate.