2017 INFINITI Q70L

Typical onset: 40,000-90,000 mi

Symptoms: Low oil pressure warning light even with adequate oil level, Metallic ticking or knocking from engine, especially on cold start, Sudden catastrophic engine failure with no prior warning in some cases, Oil starvation to main and rod bearings

Fix: Internal oil gallery gaskets deteriorate and block oil passages to bottom end. Requires complete engine teardown to access gallery plugs — most shops quote a factory reman long block or complete engine rebuild including new pistons, bearings, rings, and machining. 25-35 labor hours depending on accessibility and ancillary part replacement.

Estimated cost: $12,000-18,000

Typical onset: 60,000-110,000 mi

Symptoms: Transmission slipping or delayed engagement after radiator or cooler work, Milky or pink transmission fluid indicating coolant intrusion, Strawberry milkshake appearance in coolant reservoir, Transmission overheating warnings

Fix: Factory cooler inside radiator fails and mixes coolant with ATF, contaminating entire transmission. Requires radiator replacement, external cooler install, full transmission flush (often multiple cycles with solvent cleaning), and filter/fluid. Severe cases need valve body replacement or full transmission rebuild. 8-12 hours for cooler/flush, add 18-25 hours if transmission rebuild needed.

Estimated cost: $1,800-3,500 (flush) or $5,500-8,000 (rebuild)

Typical onset: 70,000-120,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Excessive vibration at idle in Drive, Visible sagging of transmission tailshaft when inspected on lift, Driveline vibration during acceleration

Fix: Rear transmission mount hydraulic damping fails and rubber separates. Replacement requires supporting transmission, removing exhaust heat shields, and installing OEM or upgraded polyurethane mount. 2-3 hours.

Estimated cost: $350-600

Typical onset: 80,000-130,000 mi

Symptoms: Rhythmic vibration at highway speeds (60-75 mph), Clunking or grinding from under center of vehicle, Vibration worsens under load or acceleration, Audible squealing during coast-down

Fix: Two-piece driveshaft center support bearing wears out — common on long-wheelbase models. Requires driveshaft removal, pressing out old bearing and pressing in new carrier bearing assembly. Some techs replace entire driveshaft for time savings. 3-4 hours for bearing replacement, 2 hours for complete shaft swap.

Estimated cost: $450-850 (bearing) or $900-1,400 (complete shaft)

Typical onset: 90,000-140,000 mi

Symptoms: Extended cranking before engine starts, especially when hot, Rough idle and hesitation under acceleration, Check engine light with P0087 (fuel rail pressure too low), Stalling at stops after highway driving

Fix: Direct injection high-pressure pump on 3.7L V6 wears internally. Located on rear of engine, requires intake plenum removal for access. Replace pump, clean debris from fuel rail, update in-tank filter if accessible. 4-6 hours.

Estimated cost: $1,200-1,900

Typical onset: null

Symptoms: VDC OFF and SLIP warning lights illuminated constantly, Loss of traction control and stability control intervention, ABS light may accompany VDC lights, Codes C1132, C1144 stored in ABS module

Fix: Steering angle sensor or yaw sensor drift causes VDC system disable. Requires scanning all modules, performing steering angle sensor calibration, and sometimes replacing yaw/G-sensor in ABS module. Occasionally needs complete module replacement if internal fault. 1.5-2.5 hours for calibration, 3-4 hours if module replacement needed.

Estimated cost: $250-450 (calibration) or $1,400-2,200 (module)