The 2007 Legacy GT shares the EJ255 turbo boxer with the WRX, delivering strong performance but inheriting weak points in head gaskets, ringland failures, and transmission cooler lines. It's a enthusiast's car that demands proper maintenance and often needs internal engine work by 100k-150k miles.
Ringland Failure / Cracked Pistons
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: sudden misfire on cylinder 2 or 4, P0302 or P0304 codes, loss of compression, metal debris in oil, rough idle that doesn't clear
Fix: Ringland #4 cracks most often due to detonation from poor-quality fuel or lean conditions. Requires engine-out short block replacement or full rebuild with forged pistons if you want it to last. 18-24 labor hours for short block swap, 25-30 for proper rebuild with machine work.
Estimated cost: $4,500-8,000
Head Gasket Failure (External Oil Weep)
Common · medium severityTypical onset: 100,000-140,000 mi
Symptoms: oil seepage at head-to-block surface, oil smell from exhaust manifold heat, slight coolant loss without external leak visible, occasionally white smoke on cold start
Fix: EJ255 can develop external head gasket leaks similar to naturally-aspirated EJs but less prone to coolant-into-cylinder failures. Engine-out job, replace both gaskets, resurface heads if warped, new timing components while you're in there. 16-20 hours labor.
Estimated cost: $2,800-4,200
Transmission Oil Cooler Line Failure
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: transmission fluid dripping from radiator area, sudden loss of ATF, slipping or no movement after highway driving, pink fluid pooled under engine bay
Fix: The metal cooler lines rust through where they loop near the radiator or crack at crimp points. Catastrophic ATF loss can destroy the 5EAT in minutes. Replace both cooler lines preventively, flush system, 3-4 hours labor. If you grenaded the trans from running dry, add $3k-5k for rebuild.
Estimated cost: $400-700
Turbocharger Failure
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: blue smoke on acceleration, whining or grinding noise from turbo, loss of boost pressure, oil in intercooler pipes, P0234 overboost or P0299 underboost codes
Fix: IHI VF40 turbo fails from oil starvation (missed changes, sludge) or shaft play from age. Replacement turbo plus oil feed/return lines, new gaskets, oil and coolant flush. 6-8 hours labor. OEM turbos are $1,200-1,800 new; aftermarket options $800-1,500.
Estimated cost: $1,800-3,200
Banjo Bolt Filter Clogging (Turbo Oil Feed)
Occasional · high severitySymptoms: turbo failure preceded by oil starvation, no obvious oil leaks but turbo seals fail, metal shavings in turbo oil return
Fix: The banjo bolts feeding oil to the turbo have internal screens that clog with sludge if oil changes are stretched. Starves the turbo bearings. Remove banjo bolts, clean or replace screens, flush oil system. 1-2 hours labor. Do this at every turbo replacement or you'll kill the new one.
Estimated cost: $150-300
Transmission Mount Failure
Common · low severityTypical onset: 80,000-120,000 mi
Symptoms: clunk when shifting from reverse to drive, excessive drivetrain movement felt through shifter, vibration at idle in gear, visible sagging of transmission tail
Fix: Rear trans mount tears from age and torque. Replacement requires lifting transmission slightly, 1.5-2 hours labor. OEM or upgraded polyurethane options available.
Estimated cost: $250-450
Catalytic Converter Failure
Occasional · medium severityTypical onset: 100,000-150,000 mi
Symptoms: P0420 catalyst efficiency code, rotten egg smell, loss of power, heat shield rattling, failed emissions test
Fix: Up-pipe and downstream cats fail from heat cycling and ringland failures dumping oil into exhaust. Aftermarket catted up-pipe plus downstream cat replacement, 4-6 hours labor. Some states require OEM cats for emissions.
Estimated cost: $1,200-2,500
Buy only if you can wrench yourself or have $5k saved for engine work—these are fast and fun but the EJ255 is a ticking time bomb without meticulous maintenance history.
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.