The 2003 Infiniti G35 is a sporty, rear-wheel-drive luxury sedan (also sold as a coupe) that blends strong performance with upscale features at a price that undercut many European rivals when new. It’s ideal for drivers who want a responsive, driver-focused car with a premium feel, but who don’t mind staying on top of maintenance as the miles add up. The 2003 model year launched the first-generation G35 (V35), effectively replacing the I35 and introducing Infiniti’s modern sport-sedan formula. In today’s market, it’s often compared with the BMW 3 Series and Lexus IS of the era for its balance of power, handling, and value.

- 3.5L V6 performance: The 2003 G35 uses Nissan/Infiniti’s 3.5-liter VQ35DE V6, widely known for strong acceleration and a great sound. Output varies by body style and transmission, but it’s commonly around 260 hp for the sedan and higher for some coupe applications. - Rear-wheel-drive platform: Most 2003 G35 models are rear-wheel drive, which helps deliver sharp steering feel and balanced handling compared to typical front-drive luxury sedans. - Transmission choices: Available with a 5-speed automatic or 6-speed manual (availability varies by sedan/coupe and trim), making it appealing to both commuters and enthusiasts. - Upscale interior and tech for its time: Many cars came equipped with leather, Bose audio, power seats, and available navigation, giving the G35 a premium experience without the premium repair costs of some German competitors. - Sport-oriented chassis: Firm suspension tuning, strong braking, and good highway stability are standout traits, especially on well-maintained examples with quality tires and fresh suspension components.

Shoppers searching “2003 Infiniti G35 reliability” will find a mixed but generally fair picture: the VQ35DE can be long-lasting, but age-related issues and a few known weak points show up as mileage climbs. Here are several common 2003 Infiniti G35 problems owners report: - Oil consumption and valve cover leaks: Some engines develop oil consumption as mileage rises (often noticeable past 100,000 miles), and valve cover gasket leaks can also appear. Symptoms include low oil between changes, burning-oil smell, and oil seepage around the valve covers. - Crankshaft and camshaft position sensor failures: A common drivability complaint is intermittent stalling, long cranks, or a sudden no-start condition, often tied to failing crank/cam sensors. These issues can appear around 80,000–150,000 miles and may trigger a check engine light. - Window regulator and door lock issues: Power windows can slow down, bind, or stop working due to regulator/motor wear. Door lock actuators can also weaken with age, leading to inconsistent locking/unlocking. - Suspension wear and tire wear: Control arm bushings, shocks/struts, and front end components can wear, causing clunks over bumps, wandering steering, or uneven tire wear. Many owners start replacing suspension parts in the 100,000-mile range depending on road conditions and driving style.