2013 INFINITI FX35

Typical onset: 60,000-120,000 mi

Symptoms: Transmission fluid appears milky or strawberry-milkshake colored, Coolant level drops without external leaks, Transmission slipping, delayed shifts, or complete failure, White smoke from exhaust if coolant enters transmission severely

Fix: The internal transmission cooler in the radiator corrodes and allows ATF and coolant to mix. Requires radiator replacement, transmission flush or rebuild depending on contamination severity, and coolant system flush. If caught early (just discolored fluid), 4-6 hours labor. If transmission damaged, add 12-18 hours for rebuild. Always replace radiator even if transmission seems OK—contamination will kill it eventually.

Estimated cost: $1,200-$5,500

Typical onset: 80,000-150,000 mi

Symptoms: Burning 1+ quart of oil per 1,000 miles, Blue smoke on startup or acceleration, Fouled spark plugs (oil-soaked), Check engine light with misfire codes P0300-P0306

Fix: VQ35HR engines can develop excessive wear on piston rings and cylinder walls, especially if oil changes were extended or low-quality oil used. Repair requires engine disassembly to replace pistons and rings, hone cylinders, or short block replacement if damage is severe. 20-28 hours labor depending on approach. Some owners opt for used low-mileage engine swap (10-14 hours) at similar total cost.

Estimated cost: $4,500-$8,500

Typical onset: 70,000-110,000 mi

Symptoms: Clunking noise when shifting from Park to Drive or Reverse, Excessive vibration at idle in gear, Visible sag or torn rubber on mount during inspection, Transmission feels like it's dropping into gear hard

Fix: The rear transmission mount deteriorates from age and fluid exposure (often accelerated by leaking transmission cooler). Straightforward replacement, 1.5-2.5 hours labor. Inspect all engine mounts while in there—they fail around the same timeframe.

Estimated cost: $250-$450

Typical onset: 90,000-140,000 mi

Symptoms: Rough idle or hesitation during acceleration, Check engine light with lean codes P0171/P0174, Hard starting after sitting overnight, Fuel pump whining noise from rear of vehicle

Fix: In-tank fuel filter clogs prematurely if contaminated fuel was used or tank has sediment buildup. Filter is part of the fuel pump assembly in most cases, requiring tank drop. 2-3 hours labor. Recommend tank cleaning if sediment present to prevent repeat failure.

Estimated cost: $450-$850

Typical onset: 100,000-160,000 mi

Symptoms: Rattling noise from front of engine on cold start, subsides after 5-10 seconds, Check engine light with cam/crank correlation codes P0011, P0021, Rough running until engine warms up

Fix: Primary timing chain tensioners lose tension over time, allowing chain slap on startup. Requires front engine disassembly to replace tensioners, guides, and chains. 12-16 hours labor. Cheaper to do all chains and guides at once than revisit later. Use OEM Nissan parts—aftermarket tensioners fail prematurely.

Estimated cost: $2,200-$3,800

Symptoms: No-start condition with cranking but no fire, Engine stalls while driving without warning, Check engine light with code P0335 or P0340, Tachometer drops to zero while driving

Fix: Sensor fails due to heat exposure from exhaust proximity. Leaves you stranded without warning. Replacement is 0.8-1.2 hours labor, sensor access is tight but doable. Carry a spare if you're past 100k miles—cheap insurance.

Estimated cost: $180-$320