2012 INFINITI FX35

Typical onset: 80,000-140,000 mi

Symptoms: Excessive oil consumption (1 qt per 500-1,000 miles), Blue smoke from exhaust on startup or acceleration, Low compression on multiple cylinders, Check engine light with P0300-series misfire codes, Engine may seize if oil level drops unnoticed

Fix: VQ35HR engines in this era have defective piston ring design and cylinder wall galley gasket issues causing oil to bypass into combustion chambers. Proper fix requires complete engine rebuild with updated rings and honing, or short-block replacement. 18-24 labor hours for rebuild; 12-16 for short-block swap.

Estimated cost: $4,500-8,000

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid in coolant (strawberry milkshake appearance in overflow tank), Coolant in transmission (slipping, shuddering, delayed engagement), Transmission overheating warnings on dash, Sudden transmission failure after coolant intrusion

Fix: Internal transmission cooler in radiator corrodes, allowing coolant and ATF to mix. Requires radiator replacement, external cooler install, full transmission fluid flush (multiple cycles), sometimes full transmission rebuild if coolant damaged clutches. Transmission R&R adds 6-8 hours if rebuild needed.

Estimated cost: $800-1,200 (caught early); $3,500-5,500 (with transmission rebuild)

Typical onset: 60,000-100,000 mi

Symptoms: Clunking noise when shifting from Park to Drive/Reverse, Excessive vibration at idle, especially in Drive, Visible engine/transmission movement when revving in park, Harsh shifts or delayed engagement feel

Fix: Rear transmission mount (engine side) deteriorates due to heat and weight. Rubber separates from metal housing. Straightforward replacement, 1.5-2.5 hours depending on access. Often done alongside front engine mounts if they're original.

Estimated cost: $350-650

Typical onset: 90,000-150,000 mi

Symptoms: Erratic fuel gauge readings (jumping, stuck on full/empty), Gauge reads empty when tank is full or vice versa, Fuel warning light illuminates prematurely or not at all, No other driveability issues

Fix: Fuel level sender in tank wears out—common Nissan/Infiniti issue. Requires dropping fuel tank, replacing sending unit assembly. 2.5-3.5 hours labor. Some techs access through rear seat cutout if available.

Estimated cost: $450-750

Typical onset: 120,000-180,000 mi

Symptoms: Rattling noise from engine on cold start (first 5-10 seconds), Check engine light with P0011/P0021 VVT codes, Rough idle or hesitation, Metallic grinding if severely worn

Fix: VQ35 timing chains stretch over time, especially if oil changes were extended. Tensioners and guides wear. Full timing chain job requires front cover removal, both chains, tensioners, guides, VVT solenoids. 10-14 hours labor. Valve damage possible if chain jumps timing.

Estimated cost: $2,200-3,800

Typical onset: 80,000-130,000 mi

Symptoms: Power steering fluid leak visible on inner tie rod boots or subframe, Steering feels heavy intermittently or on cold starts, Low power steering fluid level repeatedly, Whining noise from pump when turning at low speeds

Fix: Rack seals deteriorate, leak power steering fluid. Some shops attempt seal replacement (4-5 hours), but most recommend rack replacement due to internal wear. Alignment required after. 4-6 hours for rack swap.

Estimated cost: $1,200-2,000