The 2012 Infiniti G25 uses 5W-30 full-synthetic engine oil, with an approximate capacity of 5 quarts (about 4.8–5.2 quarts depending on the filter). This aligns with Infiniti’s guidance for the 2.5-liter VQ engine in this model.
This guide outlines the recommended oil type, viscosity, capacity, and change intervals to help you keep the engine protected and performing at its best. Always verify against your owner's manual and the oil cap on your engine for any climate-specific notes.
Recommended oil specifications
Below are the core oil specifications to follow for proper lubrication and engine protection.
- Viscosity: 5W-30 is the standard recommendation for most driving conditions in the 2012 G25.
- Type: Full-synthetic engine oil is recommended for best protection and longer change intervals.
- Standards: Oil should meet API SN or ILSAC GF-5 compliance and be suitable for Nissan/Infiniti VQ engines.
- Capacity: Approximately 5 quarts of oil with a new filter.
In short, use a high-quality full-synthetic 5W-30 that meets API SN/ILSAC GF-5 (any reputable brand that lists these specs is acceptable).
Oil capacity and change intervals
Know the service basics so you can plan oil changes and keep the engine healthy.
- Oil capacity: Approximately 5.0 quarts with filter installed.
- Change interval: Typically every 5,000 miles with conventional oil, and every 7,500–10,000 miles with synthetic oil, depending on driving conditions and manufacturer guidelines.
Always consult the owner's manual for the exact interval and consider monitoring via the vehicle's maintenance indicator and your driving habits.
Climate considerations for oil choice
In cooler climates, a 5W-30 synthetic still provides reliable startup protection, while in very hot or high-load conditions you might follow climate-specific guidance in the manual. Unless the manual specifies otherwise for your region, 5W-30 is the safe, standard choice.
Summary
For a 2012 Infiniti G25, the recommended oil is 5W-30 full synthetic, about 5 quarts with filter, meeting API SN/ILSAC GF-5 specifications. Always verify with your owner's manual and follow climate-appropriate guidance for viscosity and change intervals.