The 2007 G35 is a solid rear-drive sport sedan with Nissan's proven VQ35 V6, but this generation suffers from gallery gasket oil consumption issues and transmission cooler failures that can grenade the 5-speed auto if ignored.
Oil Gallery Gasket Failure / Excessive Oil Consumption
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Burning through 1+ quart per 1,000 miles, Blue smoke on startup or acceleration, Low oil pressure warning at idle when hot, Catalytic converter fouling from oil burn
Fix: Oil gallery gaskets deteriorate and starve cylinder walls of oil, causing ring wear and consumption. Proper fix requires engine removal, full teardown, gasket replacement, honing, new rings—often a reman short block makes more sense. 20-30 labor hours for full internal reseal or short block swap.
Estimated cost: $4,500-7,500
Transmission Oil Cooler Failure / Cross-Contamination
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Milky or pink transmission fluid (coolant mixing), Strawberry milkshake appearance in coolant reservoir, Transmission slipping or delayed shifts after coolant gets in, Overheating transmission or engine
Fix: Internal radiator trans cooler fails, allowing coolant into ATF and destroying clutch packs. Requires radiator replacement, external cooler install, full trans flush—or trans rebuild if contamination sat long. Catch it early: 4-6 hours. Full trans rebuild adds 12-16 hours.
Estimated cost: $800-1,200 (early catch) / $3,500-5,000 (with trans rebuild)
Camshaft Position Sensor Failure
Occasional · medium severityTypical onset: 90,000-150,000 mi
Symptoms: Intermittent crank no-start condition, Rough idle or stalling when warm, P0340 or P0345 codes (cam sensor circuit), Engine stumbles or hesitates under load
Fix: Heat-related sensor failure, common on VQ motors. Sensors are behind timing cover—requires valve cover removal for access. 2-3 hours labor per bank if doing both preventively.
Estimated cost: $400-700
Transmission Mounts Collapsing
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Clunk or thud on hard acceleration or deceleration, Vibration at idle in Drive, Excessive drivetrain movement visible from engine bay, Shifter buzz or rattle
Fix: Rear transmission mount (crossmember) fails from torque cycles. Aftermarket poly mounts last longer but add NVH. OEM replacement is 1.5-2 hours on a lift.
Estimated cost: $250-450
Window Regulator Failure
Occasional · low severityTypical onset: 80,000-120,000 mi
Symptoms: Window drops into door or won't roll up, Clicking or grinding noise when operating window, Window moves slowly or binds halfway, One-touch auto function stops working
Fix: Plastic regulator clips or cable guides break. Requires door panel removal and regulator assembly replacement. 1.5-2 hours per door.
Estimated cost: $300-500
Fuel Sending Unit / Gauge Erratic Reading
Occasional · low severityTypical onset: 100,000+ mi
Symptoms: Fuel gauge bounces or reads empty when tank has fuel, Low fuel warning light on with half tank or more, Gauge stuck at full or empty regardless of fuel level
Fix: Fuel level sensor float arm wears or sender unit corrodes. Tank drop required. 2-3 hours labor, sender unit runs $150-250.
Estimated cost: $400-600
Buy one if the oil consumption history is documented clean and the trans cooler has already been addressed—otherwise you're gambling on a $5k+ engine or transmission job.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.