2006 INFINITI FX35

3.5L V6RWDAUTOMATICgas
5-Year Cost of Ownership
$40,333 maintenance + known platform issues
~$8,067/yr · 670¢/mile equivalent · $31,743 maintenance + $7,890 expected platform issues
Common Problems & Known Issues

The 2006 FX35 is built on Nissan's FM platform with the VQ35DE V6 and RE5R05A 5-speed automatic. While these components are generally solid, this generation suffers from catastrophic engine oil consumption issues and transmission cooler failures that can total the vehicle if ignored.

Catastrophic Engine Oil Consumption (VQ35DE piston ring failure)

Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Burning 1+ quart per 1,000 miles without visible leaks, Blue smoke on cold start or acceleration, Fouled spark plugs and misfires (P0300-P0306), Low oil pressure warning if run too low
Fix: Piston ring replacement requires full engine disassembly. Rings collapse due to oil coking from extended drain intervals. Many owners opt for used low-mileage engine swaps (12-16 hours) over rebuild (25-35 hours) due to labor costs. Prevention: strict 3,500-mile synthetic oil changes.
Estimated cost: $4,500-8,500

Transmission Oil Cooler Failure (coolant-ATF cross-contamination)

Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Milky pink fluid in radiator overflow or transmission dipstick (strawberry milkshake), Transmission slipping, delayed engagement, or no movement, Overheating transmission temp gauge readings, Coolant loss without external leaks
Fix: Internal radiator failure allows coolant into ATF, destroying transmission clutches within miles. Requires radiator replacement, external cooler install, transmission rebuild or replacement (8-12 hours), and complete flush of all cooling systems. Catch it early (just cooler pink) and you may save the trans with flush only (3 hours).
Estimated cost: $800-6,500

Transmission Mount Collapse (rear mount)

Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Harsh clunk on 1-2 or 2-3 upshifts, Vibration at idle in Drive, Clunk when shifting from Park to Drive or Reverse, Excessive drivetrain movement visible from underneath
Fix: Rear transmission mount (often called crossmember mount) is fluid-filled and fails internally. Replacement is straightforward but requires trans support (2-3 hours). OE Nissan part recommended over aftermarket.
Estimated cost: $350-550

Crankshaft Position Sensor Failure

Occasional · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Random no-start condition when hot, Stalling at idle or while driving with immediate restart ability, P0335 or P0340 codes stored, Intermittent tach drop to zero while running
Fix: Sensor located at rear of engine block near bellhousing, heat-soaks and fails. Access requires removing starter and working blind (1.5-2.5 hours). Use OE Nissan sensor only; aftermarket has high failure rate.
Estimated cost: $250-450

EVAP Vent Control Valve Sticking

Occasional · low severity
Typical onset: 80,000-130,000 mi
Symptoms: P0455 or P0442 (large or small EVAP leak), Fuel tank difficult to fill, pump clicks off repeatedly, Hissing sound when opening fuel cap, Check engine light after multiple short trips
Fix: Vent valve near fuel tank fails stuck closed, creating vacuum in tank. Located forward of tank on driver side frame rail (1-1.5 hours). Test with scan tool active test before replacing.
Estimated cost: $250-400

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 vehicle pulls under braking, Uneven inner tire wear, Vibration through steering wheel 40-60 mph
Fix: Front lower control arm bushings (both front and rear positions per arm) deteriorate. Many techs replace entire arms with bushings pre-installed rather than press bushings (2.5-3.5 hours both sides). Alignment required after.
Estimated cost: $600-1,100

Valve Cover Gasket Oil Leaks

Occasional · low severity
Typical onset: 90,000-150,000 mi
Symptoms: Oil smell after engine heat-soak, Oil visible on rear of valve covers dripping to exhaust, Oil consumption without smoking (slow external leak), Visible oil residue around spark plug tube seals
Fix: Both valve cover gaskets and spark plug tube seals harden and seep. Replace both covers simultaneously with OE gaskets (3-4 hours). Good time to check/replace ignition coils if never done.
Estimated cost: $450-750
Owner tips
  • Monitor oil consumption religiously starting at 60k miles; top off every fuel fill if necessary until you can budget for engine work
  • Install external transmission cooler proactively and check radiator for coolant-ATF mixing every oil change
  • Use Nissan Matic-S ATF only; aftermarket fluids cause shift issues in the RE5R05A
  • Keep up with 3,500-mile full synthetic oil changes (0W-40 in high-mileage engines) to slow ring coking
Buy only if under 70k miles with full service records showing religious oil changes and verified no oil consumption; otherwise expect a $5k-10k engine or transmission bill as a when, not if.
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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