2018 CHEVROLET CORVETTE

Typical onset: 30,000-70,000 mi

Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), White or blue smoke from exhaust on cold start or under load, Loss of compression in one or more cylinders, Knocking or ticking noise from lower engine, eventual rod knock if driven

Fix: Full engine tear-down required. Common causes: cracked piston ring lands (#7 cylinder especially), damaged valve springs, or broken piston skirts leading to scored cylinder walls and spun bearings. GM issued a service bulletin but no official recall. Repair involves replacing pistons, rings, honing cylinders (or sleeving if scored), checking crankshaft and bearings, new gaskets throughout. 40-60 labor hours for full rebuild depending on machine shop work needed.

Estimated cost: $8,000-15,000

Typical onset: 40,000-80,000 mi

Symptoms: Red transmission fluid puddle under vehicle, typically driver's side, Transmission overheating warning on dashboard, Burnt transmission fluid smell, Slipping or delayed shifts if fluid level drops significantly

Fix: The steel lines running to the remote cooler develop leaks at crimp fittings or from road debris impact. Replace cooler lines and top off fluid, inspect cooler for damage. Sometimes the cooler itself cracks. 2-4 labor hours depending on access and whether cooler is also replaced.

Estimated cost: $600-1,200

Symptoms: Complete loss of power steering assist while driving, "Service Power Steering" warning on Driver Information Center, Heavy steering effort at low speeds or complete lockup, May occur suddenly without warning

Fix: GM recall 18V-385 addresses EPS software calibration issue, but some units still fail outright due to internal motor or control module fault. Recall involves software update; actual hardware failure requires entire EPS column assembly replacement. 3-5 labor hours for column R&R.

Estimated cost: $0 (recall) to $2,000-3,000 (post-warranty hardware failure)

Typical onset: 50,000-90,000 mi

Symptoms: Clunking noise from under vehicle during shifts, especially 1-2 or 2-1, Vibration felt through shifter or center console at idle in gear, Excessive driveline movement felt during hard acceleration or deceleration

Fix: The rear transmission mount uses a hydraulic bushing that tears or leaks fluid. Replacement is straightforward but requires lifting transmission slightly. 1.5-2.5 labor hours.

Estimated cost: $400-700

Typical onset: 60,000-100,000 mi

Symptoms: Rough idle or stumble on cold start, Hesitation or misfire under light throttle, Reduced fuel economy, Check engine light with P0300-series misfire codes

Fix: Direct injection means no fuel washing over intake valves. Carbon accumulates over time. Walnut blasting or chemical cleaning required. 4-6 labor hours to remove intake manifold and clean all eight valves.

Estimated cost: $600-1,000