2013 INFINITI G37

Typical onset: 80,000-140,000 mi

Symptoms: Burning more than 1 quart per 1,000 miles, Blue smoke on startup or acceleration, Low oil pressure warning at idle when hot, Spark plugs fouled with oil

Fix: The oil gallery gaskets deteriorate and cause internal oil loss into cylinders. Requires engine removal, complete teardown, new gallery gaskets, often new piston rings while you're in there. 25-35 hours labor. Many owners opt for short block or complete engine replacement instead of rebuild due to labor overlap.

Estimated cost: $4,500-8,000

Typical onset: 60,000-120,000 mi

Symptoms: Transmission slipping or shuddering, Coolant in transmission fluid (fluid looks milky pink), Transmission overheating warnings, Sudden transmission failure after coolant contamination

Fix: Internal cooler inside radiator fails, cross-contaminates coolant and ATF, destroys transmission within days if driven. Requires radiator replacement, transmission flush or full rebuild depending on contamination extent, all cooler lines flushed. 8-12 hours for cooler/flush, add 15-25 hours if transmission needs rebuild.

Estimated cost: $1,200-2,500 (cooler/flush only), $4,000-6,500 (if trans rebuild needed)

Typical onset: 70,000-110,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration felt through floor and shifter at idle, Excessive drivetrain movement visible when revving in Park

Fix: Rear transmission mount deteriorates, allowing excessive drivetrain movement. Straightforward replacement but requires supporting transmission. 2-3 hours labor.

Estimated cost: $350-550

Typical onset: 90,000-150,000 mi

Symptoms: Fuel gauge reading erratically or stuck, Hard starting when tank below half, Stalling or stumbling under acceleration, Check engine light with fuel system codes

Fix: Fuel pump assembly or level sender fails. Tank must be dropped for access. 3-4 hours labor.

Estimated cost: $650-950

Typical onset: 120,000-180,000 mi

Symptoms: Rattling noise from front of engine on cold start, Check engine light with camshaft position codes, Rough running or misfires if chain has jumped

Fix: Primary timing chain guides wear, chain develops slack. Requires front engine disassembly, new guides, tensioners, chains. 12-16 hours labor. Catching early prevents valve-to-piston contact.

Estimated cost: $2,200-3,500

Symptoms: Car won't start, steering wheel locked, Dash displays 'Steering lock malfunction', Clicking sound from steering column when trying to start, No warning before failure, just dead one morning

Fix: Electronic steering lock motor seizes, prevents starting. Emergency fix is to pull fuse #46 to bypass (disables lock permanently). Proper fix is module replacement behind steering column. 2-3 hours labor. Known defect, some extended warranty coverage existed.

Estimated cost: $500-800 (or $0 if you pull the fuse and live without auto-lock)