2009 INFINITI G37

Typical onset: 80,000-140,000 mi

Symptoms: Sudden oil pressure warning light or gauge drop, Rod knock or bottom-end knocking especially when warm, Metal shavings in oil during routine changes, Catastrophic failure with no prior oil consumption warnings in some cases

Fix: Gallery gaskets fail internally, starving bearings of oil. Requires full engine teardown to replace gaskets, rod/main bearings, and often crankshaft polishing or replacement. 20-30 hours labor depending on damage extent. Many opt for used/reman long blocks instead of in-chassis rebuild due to labor cost.

Estimated cost: $4,500-8,500

Typical onset: 60,000-100,000 mi

Symptoms: Burning through 1+ quart every 1,000-2,000 miles, Blue smoke on cold start or hard acceleration, Fouled spark plugs on cylinders 5-8 more often, Low oil pressure if level drops unnoticed

Fix: VQ37VHR known for ring land failures and bore glazing, especially on early production. Only real fix is engine rebuild with new pistons, rings, and honing/sleeving cylinders. 25-35 hours for full teardown and rebuild. Some owners band-aid it by topping off oil religiously.

Estimated cost: $5,000-9,000

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid mixing with coolant (strawberry milkshake in reservoir), Transmission slipping or delayed shifts, Overheating transmission or coolant temp spikes, Pink residue in coolant overflow tank

Fix: Internal cooler in radiator fails, cross-contaminates fluids and destroys transmission if not caught early. Requires radiator replacement, full trans flush (often multiple), and filter service. If cross-contamination went unnoticed, transmission rebuild needed. 3-5 hours for cooler/radiator and fluid service alone.

Estimated cost: $800-1,500 (caught early); $3,500-5,500 (trans damage)

Typical onset: 60,000-90,000 mi

Symptoms: Clunk or thud during 1-2 or 2-3 upshift, Vibration at idle in Drive, smooths in Park/Neutral, Excessive driveline movement visible from underneath during throttle blip

Fix: Rear transmission mount (and sometimes front engine mounts) deteriorate, especially on cars driven hard. Mount replacement straightforward. 1.5-2.5 hours for trans mount, add 1 hour each for engine mounts if also needed.

Estimated cost: $300-600

Symptoms: Car will not start, steering wheel won't unlock, Dash warning 'Steering lock malfunction', Clicking noise from column when pressing start button, Stranded in parking lot or driveway

Fix: Electronic steering lock module fails, preventing ignition. Common across VQ37 platform (G37, 370Z). Replace module or install bypass harness. 2-3 hours if dealer module, 1 hour for aftermarket bypass fuse solution many owners do preemptively.

Estimated cost: $500-1,200 (dealer module); $50-150 (DIY bypass)

Typical onset: 90,000-130,000 mi

Symptoms: Inaccurate fuel gauge (reads full when low, or erratic), Fuel pump whine audible in cabin, Hard start or stalling when tank below 1/4, Check engine light with fuel system lean codes

Fix: Fuel level sender or pump fails in tank. Requires dropping fuel tank, replacing pump assembly. 3-4 hours labor. Fuel filter is integral to pump on this chassis, replaced together.

Estimated cost: $600-1,100