The 1993 Infiniti G20 is essentially a rebadged Nissan Primera with the SR20DE engine — a solid platform when maintained, but these are 30+ year-old cars now with predictable age-related failures around engine internals, transmission mounts, and fuel system components.
SR20DE Distributor O-Ring Oil Leak
Common · medium severityTypical onset: 80,000-150,000 mi
Symptoms: oil pooling around distributor base, potential distributor failure if left unchecked, rough idle or misfires after oil intrusion
Fix: Replace distributor O-ring seal — 1.5 hours labor including distributor removal and cleaning. Simple fix that prevents expensive distributor replacement.
Estimated cost: $150-300
Transmission Mount Failure
Common · medium severityTypical onset: 90,000-130,000 mi
Symptoms: excessive engine movement during acceleration, clunking when shifting into gear, vibration at idle in gear
Fix: Replace front and/or rear transmission mounts — 2-3 hours labor. OEM mounts preferred as aftermarket versions wear faster.
Estimated cost: $250-450
Timing Chain Tensioner and Guide Wear
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: rattling on cold starts for first 2-3 seconds, timing chain noise at idle, rare cases of jumped timing causing valve damage
Fix: Replace timing chain, tensioner, guides, and oil pump drive chain while you're in there — 8-10 hours labor. Skip this and risk catastrophic engine damage.
Estimated cost: $1,200-1,800
Piston Ring and Cylinder Wall Wear (High-Mileage)
Occasional · high severityTypical onset: 180,000-250,000 mi
Symptoms: blue smoke on deceleration, high oil consumption (1 qt per 1,000 mi or worse), loss of compression and power
Fix: Engine rebuild or short block replacement — 18-22 hours labor for proper rebuild with machine work, new pistons, rings, bearings. Some owners opt for used engine swap at 12-14 hours.
Estimated cost: $3,500-5,500
Fuel Filler Pipe Corrosion (Recall-Related)
Occasional · medium severitySymptoms: fuel smell near rear wheel well, visible rust or holes in filler neck, fuel leak when filling tank
Fix: Replace fuel filler pipe and check surrounding area for rust damage — 2-3 hours labor. NHTSA recall may have addressed this on some units, but age and road salt bring it back.
Estimated cost: $300-500
Front Lower Control Arm Bushing Deterioration
Common · low severityTypical onset: 100,000-150,000 mi
Symptoms: clunking over bumps, wandering steering or vague feel, uneven tire wear on inner edges
Fix: Replace front lower control arm bushings or entire arms — 3-4 hours labor for both sides. Most techs replace the whole arm for easier alignment.
Estimated cost: $400-700
Buy one if it has documented timing chain service and doesn't smoke — clean examples are reliable daily drivers, but avoid high-mileage neglected units unless you're ready for an engine refresh.
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.