In brief, the Infiniti G35x’s most common problems tend to center on oil consumption and leaks, transmission/AWD driveline issues, cooling-system failures, and electrical or suspension wear.
The G35x is the all-wheel-drive version of Infiniti’s G35 from the mid-2000s. Built on the V35 platform with the VQ35DE V6, these cars combine sporty performance with all-wheel traction. Over time, several issues have been frequently reported by owners and shop technicians. This article outlines the main trouble areas, how they present, and what to watch for when evaluating a used G35x.
Mechanical and powertrain concerns
Before listing the issues, note that these problems are commonly reported across G35x models and can vary by year, mileage, and maintenance history.
- Oil consumption and leaks: The VQ35DE engine can burn oil as it ages, and common leak sources include the valve cover gaskets, rear main seal, and PCV system. Regularly check the oil level and look for seepage around the valve covers or oil pan.
- Ignition and fuel-system faults: Worn spark plugs and ignition coils, plus sensors such as the MAF or O2 sensors, can cause misfires or rough idle. Coil packs can fail with mileage and trigger misfire codes (P0300-series).
- Cooling-system failures: Water-pump leaks, deteriorating radiator hoses, a cracked reservoir, or thermostat issues are frequent maintenance items. Look for gradual coolant loss or overheating symptoms.
- Timing-chain/tensioner wear: The VQ35DE uses a timing chain; over time the tensioners or guides can wear, producing a light rattling on cold starts or unusual engine noises. Replacing tensioners/guides is more invasive than a typical belt service.
- Transmission and AWD driveline concerns: The 5-speed automatic transmission can exhibit rough shifting or slipping, especially with high mileage. The AWD center differential viscous coupling can leak or wear, causing vibrations or noise in AWD operation.
- Suspension and steering wear: Front lower control arm bushings, ball joints, tie-rod ends, and strut mounts can wear, leading to clunks, imprecise steering, and uneven tire wear. Regular inspection helps catch these before serious alignment issues.
- Electrical and sensor faults: Wheel-speed sensors can trigger ABS/traction-control warnings. Other common failures involve O2 sensors, MAF sensors, crank/cam position sensors, and aging electrical connectors.
- Air conditioning faults: A/C compressor clutch issues or refrigerant leaks can reduce cooling performance, particularly in hot climates or with high-mileage units.
- Water intrusion and interior concerns: Clogged sunroof drains can cause leaks into the headliner and interior, and power window regulators can wear, resulting in slow or non-operational windows.
Concluding note: While not every G35x experiences all of these issues, the risk grows with mileage and inconsistent maintenance. A thorough pre-purchase inspection and a documented service history are essential when evaluating a used G35x, and it’s wise to check for any open recalls or service bulletins related to the drivetrain or AWD system.
Summary
The Infiniti G35x offers engaging performance with all-wheel traction, but buyers and owners should stay aware of recurring oil, driveline, cooling, and electrical/suspension issues. Regular maintenance, prompt attention to unusual noises or leaks, and a comprehensive inspection can help manage repair costs and keep the AWD model running smoothly over time.