2004 INFINITI FX35

3.5L V6RWDAUTOMATICgas
5-Year Cost of Ownership
$15,034 maintenance + known platform issues
~$3,007/yr · 250¢/mile equivalent · $5,159 maintenance + $9,175 expected platform issues
Common Problems & Known Issues

The 2004 FX35 is a first-gen luxury crossover built on the FM platform with Nissan's VQ35DE V6. While the chassis and AWD system are generally robust, this model year suffers from catastrophic engine oil consumption issues and transmission cooler failures that can cascade into expensive repairs.

VQ35DE Engine Oil Consumption / Piston Ring Failure

Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (1 quart per 500-1,000 miles), Blue smoke from exhaust on startup or acceleration, Low oil pressure warning or rough idle, Check engine light with misfire codes (P0300-P0306)
Fix: VQ35DE engines in this era suffer from piston ring land failure and oil control ring coking. Proper fix requires engine teardown, re-ring job, or short block replacement. Often cylinder scoring means full rebuild or used engine swap. 18-28 labor hours for rebuild, 12-16 for swap.
Estimated cost: $4,500-7,500

Transmission Oil Cooler Failure (Cross-Contamination)

Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Pink or milky transmission fluid (coolant mixing), Transmission slipping, delayed engagement, or no forward gears, Overheating transmission temp warnings, Engine coolant looks brown or has oily sheen
Fix: Internal cooler in radiator fails, allowing coolant and ATF to mix. Destroys transmission internals if driven. Requires radiator replacement, transmission rebuild or replacement, full fluid flushes of both systems, all cooler lines. 14-20 labor hours total.
Estimated cost: $3,800-6,200

Transmission Mounts Collapse

Common · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Vibration at idle in gear, Excessive drivetrain movement felt during acceleration, Visible sagging of transmission when inspected on lift
Fix: Hydraulic transmission mounts wear and collapse, especially rear mount. Requires subframe drop for rear mount access. 3-5 labor hours for rear mount, 1.5-2 for front.
Estimated cost: $450-900

Front Lower Control Arm Bushings

Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Uneven tire wear on inside edges, Failed state inspection for excessive play
Fix: Front lower control arm bushings are not serviceable separately—requires complete arm replacement both sides. Alignment mandatory after. 3-4 labor hours plus alignment.
Estimated cost: $800-1,200

Fuel Sending Unit / Fuel Pump Failure

Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Fuel gauge reading erratically or stuck, Intermittent no-start or stalling when tank below 1/4, Whining noise from rear when key on, Check engine light with fuel system lean codes
Fix: Fuel pump assembly or level sender fails. Requires dropping fuel tank. 2.5-4 labor hours depending on rust/corrosion of tank straps and shields.
Estimated cost: $650-1,100

Headlight Lens Hazing and Moisture Intrusion

Occasional · low severity
Symptoms: Clouded or yellowed headlight lenses reducing output, Condensation inside headlight assemblies, Failed state inspection for headlight aim/brightness, HID bulbs failing prematurely due to moisture
Fix: Headlight assemblies develop seal failures and UV damage. Polishing helps temporarily but replacement often needed for proper beam pattern. OEM assemblies are expensive; quality aftermarket available. 1-2 labor hours.
Estimated cost: $400-1,200

Rear Differential Bushing Wear (AWD Models)

Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Clunking from rear on acceleration or deceleration, Vibration at highway speeds, Visible differential movement or torn bushings on inspection, Whining or howling from rear (if bushing failure damages bearings)
Fix: Rear differential mount bushings deteriorate causing excessive movement. Subframe bushings often need replacement at same time. 4-6 labor hours for differential mounts and subframe bushings together.
Estimated cost: $700-1,300
Owner tips
  • Check oil level every fillup—these engines consume oil even when 'healthy.' Carry a quart in the cargo area.
  • Inspect transmission fluid color monthly. Any pink tint means immediate radiator replacement before transmission damage occurs.
  • Use Nissan/Infiniti OEM transmission fluid only (Matic-J for RE5R05A). Aftermarket fluids cause shifting issues.
  • Budget $1,000-1,500/year for deferred maintenance items if buying over 100k miles—these nickel-and-dime you.
  • Pre-purchase inspection must include compression test, oil consumption check, and transmission fluid analysis—deal-breakers are common.
Only buy if under 80k miles with impeccable service records and you have $3k-5k emergency fund for engine failure—this is a gamble, not a value.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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