2003 SUBARU LEGACY GT

Typical onset: 80,000-140,000 mi

Symptoms: External oil seepage around head/block junction, Coolant consumption without visible leaks, White exhaust smoke on cold start, Overheating under boost or highway driving

Fix: Full head gasket replacement requires engine-out or lifting the engine for access on turbos. Budget 12-16 labor hours. ALWAYS resurface heads and replace timing components, water pump, and all coolant hoses while you're in there. Many shops quote head gasket alone but the job balloons when heads are warped or cam carriers leak.

Estimated cost: $2,800-4,500

Typical onset: 100,000-160,000 mi

Symptoms: Blue smoke on deceleration or startup, Loss of power and boost pressure, Loud whining or grinding from turbo area, Excessive oil consumption (1 qt per 500-1000 mi)

Fix: TD04 turbos fail from oil starvation (clogged banjo filters), poor oil quality, or just age. Replacement is 6-8 hours including new oil feed/return lines, banjo bolt filters, and coolant lines. OEM turbos are NLA; expect aftermarket or rebuilt. Always replace the oil pickup tube O-ring when doing this job.

Estimated cost: $1,800-3,200

Typical onset: 70,000-120,000 mi

Symptoms: Clunking when shifting into reverse or drive, Vibration at idle that worsens with AC on, Excessive driveline movement during acceleration, Visible sagging or torn rubber on rear trans mount

Fix: The rear transmission crossmember mount fails predictably. Replacement is straightforward: support trans, unbolt crossmember, swap mount. 1.5-2 hours. Do ALL engine/trans mounts if the car has 100k+ miles — labor overlap saves money. Pitch stop mount up front also commonly tears.

Estimated cost: $250-500

Typical onset: 90,000-150,000 mi

Symptoms: ATF puddles under driver side of engine bay, Low transmission fluid warnings or slipping, Pink fluid dripping near radiator, Burned ATF smell after highway driving

Fix: Hard lines corrode at fittings or rubber hoses crack at the cooler. If caught early, replace lines and top off fluid — 2-3 hours. If driven low on fluid, internal damage requires transmission rebuild. The in-radiator cooler can also fail and cross-contaminate coolant/ATF (strawberry milkshake of death).

Estimated cost: $350-700

Typical onset: 120,000-180,000 mi

Symptoms: Loud ticking/tapping from valve covers on cold start, Noise persists after warmup (indicates cam lobe wear), Check engine light with valve timing codes, Rough idle or misfires

Fix: EJ20 hydraulic lifters collapse from sludge or wear. If just lifters, replacement is 8-10 hours with heads on the car. If cam lobes are scored (common with oil neglect), add camshaft R&R. This becomes a 14-18 hour job and you're approaching head gasket job territory cost-wise. Oil change history makes or breaks this engine.

Estimated cost: $1,400-3,500

Typical onset: 100,000-160,000 mi

Symptoms: Severe vibration at idle that smooths out at higher RPM, Visible wobble on crank pulley when running, Accessory belt repeatedly throwing or squealing, Rubber ring separating from pulley hub

Fix: The rubber damper deteriorates and the outer ring separates, causing vibration that can damage the crankshaft or throw the serpentine belt. Replacement requires crank pulley puller and installer tools. 2-3 hours. If the belt comes off at highway speed and you lose power steering/charging, it's a tow job.

Estimated cost: $400-650

Symptoms: Hesitation or stumble under hard acceleration, Loss of boost pressure above 4000 RPM, Fuel pump whine getting louder over time, Limp mode or fuel trim codes

Fix: In-tank fuel filter is often neglected. Subaru says lifetime; reality is 60-80k miles in areas with ethanol fuel. Requires dropping the fuel tank. 3-4 hours. If the pump has been starved, replace it too — labor's already done. This is preventive maintenance many owners skip until drivability suffers.

Estimated cost: $350-750