2007 INFINITI M35

3.5L V6RWDAUTOMATICgas
5-Year Cost of Ownership
$60,142 maintenance + known platform issues
~$12,028/yr · 1,000¢/mile equivalent · $31,743 maintenance + $7,649 expected platform issues
Common Problems & Known Issues

The 2007 Infiniti M35 with the VQ35DE/HR 3.5L V6 is a comfortable luxury sedan that suffers from catastrophic engine failures due to factory-defective piston ring land design, plus transmission cooler leaks that can destroy the transmission if ignored. These are not wear-and-tear issues—they're design flaws that strike without warning.

Catastrophic Engine Failure - Piston Ring Land Collapse

Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (1 qt per 500-1000 miles), White/blue smoke from exhaust on startup or acceleration, Loss of compression in one or multiple cylinders, Check engine light with misfire codes (P0300 series), Sudden catastrophic failure with metal debris in oil pan
Fix: Factory piston ring lands crack and collapse, allowing oil past rings. Only real fix is engine rebuild with aftermarket upgraded pistons or short-block replacement. 25-35 labor hours for removal, rebuild, and reinstallation. Many shops won't attempt rebuild—go straight to used/reman engine.
Estimated cost: $5,500-9,000

Transmission Oil Cooler Line Failure and Cross-Contamination

Common · high severity
Typical onset: 60,000-110,000 mi
Symptoms: Pink milky substance in coolant reservoir (coolant in trans fluid), Transmission slipping, delayed engagement, or erratic shifting, Overheating transmission temperature warnings, Coolant loss with no external leaks, Strawberry milkshake appearance in transmission dipstick
Fix: Factory cooler inside radiator fails, allowing coolant and ATF to mix. Requires new radiator, complete transmission flush (often multiple flushes), and if contamination severe, full transmission rebuild or replacement. External cooler install recommended. 8-12 hours labor for radiator and flush; add 18-25 hours if transmission needs rebuild.
Estimated cost: $1,200-2,500 (cooler/flush only); $4,500-7,000 (with transmission rebuild)

Transmission Mount Failure

Common · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunking or thudding when shifting from Park to Drive/Reverse, Excessive vibration at idle in Drive, Visible sagging or torn rubber on mount during inspection, Jerky acceleration from stop
Fix: Hydraulic transmission mount degrades and fails, allowing excessive powertrain movement. Replacement is straightforward but requires supporting transmission. 2-3 hours labor.
Estimated cost: $450-750

Fuel Filter/Fuel Pump Assembly Clogging

Occasional · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Hard starting, especially when hot, Loss of power under acceleration or at highway speeds, Engine stumbling or surging, Check engine light with lean codes (P0171/P0174), Stalling after refueling
Fix: In-tank fuel filter clogs from debris and varnish, starving engine of fuel. Requires fuel pump module replacement (filter not serviceable separately). Tank drop required. 3-4 hours labor.
Estimated cost: $800-1,300

Crankshaft Position Sensor Failure

Occasional · high severity
Symptoms: No-start condition with cranking but no fire, Stalling while driving with no restart, Intermittent stalling when hot, Check engine light with P0335 or P0340 codes, Tachometer drops to zero while driving
Fix: Sensor fails due to heat exposure, typically without warning. Located on back of engine block near bellhousing—requires removing intake manifold and accessories for access on some VQ variants. 3-5 hours labor depending on accessibility.
Estimated cost: $450-850

Front Lower Control Arm Bushing Deterioration

Common · low severity
Typical onset: 80,000-130,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or vague steering feel, Uneven tire wear on inner edges, Failed state inspection due to excessive play
Fix: Factory bushings deteriorate and tear. Infiniti doesn't sell bushings separately—requires entire control arm replacement both sides. Alignment mandatory after. 3-4 hours labor for both sides plus alignment.
Estimated cost: $900-1,400
Owner tips
  • Check oil level every fuel fill—consumption is early warning of piston failure. Budget for engine rebuild/replacement if buying high-mileage.
  • Inspect coolant reservoir religiously for pink/milky contamination. Catch cooler failure early to save the transmission.
  • Install external transmission cooler proactively if radiator is original—cheap insurance against $6k disaster.
  • Service transmission fluid every 30k miles with Nissan Matic-S only—helps prolong life of aging transmission.
  • Pre-purchase inspection MUST include compression test and oil consumption check. Walk away if consumption exceeds 1 qt per 1500 miles.
Only buy if engine has been rebuilt with upgraded pistons or replaced entirely, and transmission cooler has been addressed—otherwise you're buying someone else's ticking time bomb at 100k+ miles.
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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