2011 INFINITI G25

Typical onset: 80,000-130,000 mi

Symptoms: Transmission slipping or erratic shifting, Milky or pink fluid in coolant reservoir (coolant in ATF), Strawberry milkshake appearance in transmission fluid, Transmission failure after coolant mixing

Fix: Replace radiator with updated design (no internal ATF cooler), install external transmission cooler, flush both cooling and transmission systems completely. If contamination occurred, transmission rebuild or replacement usually required. 6-10 hours labor depending on transmission damage.

Estimated cost: $1,200-1,800 (preventive radiator/cooler), $3,500-5,500 (if transmission damaged)

Typical onset: 90,000-140,000 mi

Symptoms: Oil seeping from timing cover area on driver's side, Oil consumption increasing (1 qt per 1,500-2,000 mi), Oil pooling on subframe or visible drips, No visible external leak from valve covers or pan

Fix: Remove timing covers, replace oil gallery gaskets behind timing chain area. Often done with timing chain service since access is same. 8-12 hours labor for gaskets alone, 12-15 if combining with chain/guides.

Estimated cost: $1,800-2,800 (gaskets only), $2,500-3,800 (with timing components)

Typical onset: 60,000-110,000 mi

Symptoms: Excessive oil consumption (1 qt per 500-1,000 mi), Blue smoke on startup or acceleration, Loss of compression in one or more cylinders, Misfires under load with stored P030X codes

Fix: Usually stems from extended oil change intervals or running low on oil. Requires engine rebuild with new pistons, rings, and cylinder honing or re-sleeving if scoring is deep. 25-35 hours for full rebuild, 18-22 for short block swap.

Estimated cost: $5,500-8,500 (rebuild), $4,500-6,500 (used/reman short block)

Typical onset: 70,000-120,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Visible sagging of transmission tailshaft, Increased cabin noise and harshness

Fix: Replace rear transmission mount (crossmember mount). Access from underneath, 1.5-2.5 hours labor. OEM mount recommended over aftermarket.

Estimated cost: $250-450

Typical onset: Not mileage-driven

Symptoms: P0455 or P0442 (EVAP large/small leak codes), Fuel smell near rear of vehicle, Check engine light intermittent or constant, Difficulty fueling (pump clicks off repeatedly)

Fix: Common culprits: purge valve, vent valve, or cracked vapor lines near charcoal canister. Smoke test required for diagnosis. 1-3 hours depending on component location.

Estimated cost: $200-600

Typical onset: Not mileage-driven

Symptoms: Key won't turn or vehicle won't start, Steering wheel locked and won't release, Warning message about steering lock, Completely random occurrence, often after sitting

Fix: Electronic steering lock module fails and prevents starting. Replacement requires column disassembly and programming. 2-3 hours labor. Many owners proactively remove the module and install a bypass harness.

Estimated cost: $800-1,400 (dealer replacement), $150-300 (DIY bypass kit)