2008 INFINITI M35

3.5L V6RWDAUTOMATICgas
5-Year Cost of Ownership
$61,702 maintenance + known platform issues
~$12,340/yr · 1,030¢/mile equivalent · $31,743 maintenance + $9,209 expected platform issues
Common Problems & Known Issues

The 2008 Infiniti M35 uses Nissan's VQ35HR V6 paired with a 5-speed automatic (RE5R05A). While the chassis is solid, this generation suffers from catastrophic engine failures due to timing system defects and transmission cooler issues that can destroy both the engine and transmission.

Timing Chain Guide and Galley Gasket Failure Leading to Engine Destruction

Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Cold-start rattle lasting 3-5 seconds (early warning sign), Check engine light with timing correlation codes (P0011, P0021), Metallic rattling from front of engine that worsens over time, Sudden catastrophic failure: loss of oil pressure, seized engine, metal shavings throughout oil system
Fix: The VQ35HR has a design flaw where timing chain secondary tensioners wear and galley gasket O-rings deteriorate, causing oil starvation to the timing components. Fragments contaminate the entire engine. Proper fix requires complete engine rebuild with updated components (tensioners, guides, galley gaskets) or replacement with a newer VQ35HR. Labor: 25-35 hours for rebuild, 18-22 hours for used engine swap.
Estimated cost: $6,500-12,000

Transmission Oil Cooler Contamination (Radiator End Tank Failure)

Common · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Milkshake appearance in coolant overflow (transmission fluid mixing with coolant), Transmission slipping, delayed engagement, or complete failure shortly after coolant contamination, Pink or strawberry-colored residue in radiator or overflow tank, Engine overheating combined with transmission issues
Fix: The internal transmission cooler in the radiator develops cracks, allowing coolant and ATF to cross-contaminate. Once this happens, transmission is typically destroyed within days. Requires radiator replacement with external transmission cooler installation, complete transmission flush or replacement, and full cooling system flush. If caught early (within 24 hours): 8-10 hours labor. If transmission damaged: add 12-16 hours for transmission R&R and rebuild/replacement.
Estimated cost: $1,800-2,500 if caught early, $5,000-8,500 with transmission damage

Transmission Valve Body and Solenoid Pack Failure

Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Harsh 2-3 or 3-4 upshifts, especially when cold, Flare or slip during shifts under load, Check engine light with shift solenoid codes (P0745, P0750, P2761), Erratic shifting patterns or delayed downshifts
Fix: The RE5R05A transmission's valve body solenoids stick or fail, particularly the line pressure and shift solenoids. Requires transmission pan drop, valve body removal, solenoid pack replacement, and often valve body reconditioning. Labor: 6-8 hours. Some shops replace the entire valve body assembly to avoid comebacks.
Estimated cost: $1,200-2,200

Front Lower Control Arm Bushings and Ball Joints

Common · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: Clunking over bumps from front suspension, Vibration or shimmy during braking, Uneven or cupped tire wear on inside edge, Wandering or vague steering feel
Fix: The front lower control arms use pressed-in bushings that deteriorate and crack, and the ball joints wear. Infiniti sells only complete control arm assemblies (no serviceable bushings). Both sides should be done simultaneously. Labor: 3-4 hours for both sides. Alignment required afterward (add 1 hour).
Estimated cost: $900-1,400

Rear Differential Fluid Contamination and Bearing Failure

Occasional · medium severity
Typical onset: 100,000-150,000 mi
Symptoms: Whining or howling noise from rear on acceleration or deceleration, Clunking when shifting from reverse to drive, Vibration at highway speeds that changes with throttle input, Metallic particles in differential fluid during service
Fix: The rear differential sees neglect (Infiniti spec is 'lifetime' fluid, which is nonsense). Bearings wear and create metal contamination. If caught early with fluid change using proper 75W-90 GL-5, can extend life. Once bearings howl, requires differential teardown and rebuild. Labor: 8-12 hours for rebuild.
Estimated cost: $150-250 for preventive fluid change, $1,800-3,000 for rebuild

Power Steering Pump Failure and High-Pressure Hose Leaks

Occasional · low severity
Typical onset: 80,000-120,000 mi
Symptoms: Whining noise from engine bay that increases with steering input, Heavy steering effort, especially at low speeds, Power steering fluid leaking near firewall or under pump, Groaning when turning wheel at full lock
Fix: The hydraulic power steering pump develops internal wear, and the high-pressure hose (running along firewall) cracks at crimp points. Pump replacement: 2-3 hours. High-pressure hose: 3-4 hours (requires removing intake components for access). Replace both simultaneously to avoid comeback.
Estimated cost: $800-1,400
Owner tips
  • Change transmission fluid every 30,000 miles with Nissan Matic-S ONLY—aftermarket fluids cause valve body issues
  • Install an external transmission cooler immediately and bypass the radiator's internal cooler to prevent cross-contamination
  • Listen for ANY cold-start rattle; if present, budget for engine work NOW before catastrophic failure
  • Service rear differential at 60k with 75W-90 GL-5 synthetic regardless of 'lifetime fill' nonsense in the manual
  • Pre-purchase inspection MUST include borescope of timing chain area and transmission fluid analysis—walk away if metal is present
Avoid unless under 60,000 miles with full service records proving timing components and transmission cooler have been addressed—the VQ35HR timing failure is a financial hand grenade.
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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