The 2020 Legacy XT with the FA24 2.4L turbo represents Subaru's newer direct-injection platform, generally more reliable than older EJ engines but showing early patterns of oil consumption, CVT cooling issues, and occasional catastrophic internal failures under certain conditions.
CVT Transmission Oil Cooler Failure
Occasional · high severityTypical onset: 40,000-80,000 mi
Symptoms: Transmission overheating warnings on dash, Limp mode or delayed shifting when hot, Coolant mixing with ATF creating milkshake fluid, Sweet smell from exhaust or coolant loss
Fix: Replace transmission oil cooler assembly and flush both cooling system and CVT fluid. Some cases require CVT replacement if contamination occurred. 4-6 hours labor for cooler only, 12-15 hours if CVT is damaged.
Estimated cost: $1,200-2,500 for cooler; $5,500-7,500 if CVT needs replacement
Excessive Oil Consumption / Piston Ring Issues
Occasional · high severityTypical onset: 30,000-70,000 mi
Symptoms: Burning 1+ quart per 1,000-1,500 miles, Blue smoke on cold start or acceleration, Low oil warning light between changes, Carbon buildup on intake valves causing rough idle
Fix: Early cases warranty-covered if documented. Post-warranty requires piston ring replacement or short block. Rings alone: 18-22 hours. Short block: 24-28 hours including timing components, fluids, gaskets.
Estimated cost: $4,500-6,500 for rings; $7,500-10,000 for short block
Rod Bearing Failure (Aggressive Driving / Poor Maintenance)
Rare · high severityTypical onset: 50,000-90,000 mi
Symptoms: Metallic knocking that increases with RPM, Low oil pressure warning, Metal shavings in oil filter, Sudden catastrophic engine seizure
Fix: Usually occurs with extended oil changes, hard launches, or sustained high-RPM driving. Requires engine teardown, crankshaft inspection/machining, all bearings, and typically pistons. 26-32 hours. Often more cost-effective to install reman short block.
Estimated cost: $8,000-12,000
Transmission Mount Failure
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive, Excessive vibration at idle in Drive, Transmission movement visible under hard acceleration, Rattling over bumps from driveline
Fix: Rear transmission mount deteriorates from heat and engine torque. Straightforward replacement, 1.5-2.5 hours depending on access. Use OEM or quality aftermarket; cheap mounts fail quickly.
Estimated cost: $250-450
Direct Injection Carbon Buildup
Common · medium severityTypical onset: 50,000-80,000 mi
Symptoms: Rough idle when cold, Misfires or hesitation on acceleration, Decreased fuel economy, Check engine light for multiple cylinder misfires
Fix: DI engines lack fuel wash over intake valves. Requires walnut blasting of intake valves. Preventable with catch can or periodic cleaning. 3-5 hours labor including intake manifold removal.
Estimated cost: $500-800
Fuel Filter / Fuel Pump Assembly Issues
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Hard starting after sitting, Sputtering or loss of power under load, Stalling when fuel tank below quarter-full, Whining noise from rear of vehicle
Fix: In-tank fuel pump assembly includes non-serviceable filter. Requires tank drop and complete pump module replacement. 2.5-3.5 hours labor. Use OEM; aftermarket pumps often fail prematurely.
Estimated cost: $650-1,100
Solid used buy if well-maintained with documented oil changes; avoid high-mileage examples with unknown service history or track/autocross use.
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.