The 1987 Beretta with the 2.8L V6 is a first-year GM L-body with typical late-80s build quality issues. Engine longevity problems dominate the repair landscape, particularly head gasket failures and bottom-end wear that often leads to complete rebuilds.
2.8L V6 Head Gasket Failure
Common · high severityTypical onset: 80,000-120,000 mi
Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Oil milkshake on dipstick, Overheating, Rough idle when cold
Fix: Both head gaskets typically fail together on this engine. Requires cylinder head removal, resurfacing heads (usually warped), new gaskets, timing components, and coolant system flush. 12-16 hours labor. Often uncovers additional problems like cracked heads.
Estimated cost: $1,800-2,800
Crankshaft and Main Bearing Wear Leading to Engine Rebuild
Common · high severityTypical onset: 100,000-150,000 mi
Symptoms: Heavy knocking from bottom end, Low oil pressure at idle, Metallic rattle on cold start, Oil consumption increases dramatically, Metal shavings in oil
Fix: The 2.8L V6 suffers from inadequate oiling to main bearings under sustained highway use. Once bearing wear starts, it cascades quickly. Full rebuild includes crankshaft machining/replacement, all bearings, piston rings, gaskets, timing components. 20-28 hours labor. Many opt for long block replacement instead.
Estimated cost: $3,500-5,500
Automatic Transmission (THM 125C) Failure
Common · high severityTypical onset: 90,000-130,000 mi
Symptoms: Slipping between 2nd and 3rd gear, Delayed engagement when cold, No reverse or weak reverse, Whining noise in gear, Shuddering during acceleration
Fix: The transverse 3-speed automatic behind the 2.8L is notoriously weak. Internal clutch pack wear and valve body issues are typical. Rebuild requires 10-14 hours including R&R. Transmission mounts also commonly fail, causing harsh shifting and clunking.
Estimated cost: $1,800-2,600
Fuel System Degradation
Occasional · medium severityTypical onset: any mileage (age-related)
Symptoms: Hard starting when hot, Stalling at idle, Loss of power under load, Fuel smell in cabin, Check engine light for lean condition
Fix: Age-related fuel system issues include failing in-tank pump, clogged filter (often overlooked), deteriorated fuel lines, and leaking injectors. Pump replacement requires tank drop, 3-4 hours. Filter is inline and straightforward, 0.5 hours. Lines often crack at connections.
Estimated cost: $400-900
Engine Mount Collapse
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Excessive engine movement on acceleration, Clunking when shifting into gear, Vibration through steering wheel, Engine visibly tilts in bay
Fix: The hydraulic engine mounts fail, allowing excessive drivetrain movement that stresses transmission mounts and halfshaft boots. Front mount is 2-3 hours, transmission mount is 1.5-2 hours. Usually need to replace multiple mounts simultaneously.
Estimated cost: $350-650
Intake Manifold Gasket Leaks
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Coolant seepage at manifold edges, Rough idle and stumbling, Coolant smell but no obvious leak, White residue around intake ports
Fix: The 2.8L uses composite intake gaskets that deteriorate and allow coolant and vacuum leaks. Requires intake removal, gasket replacement, possible manifold resurfacing. 6-8 hours labor. Often done preventively when doing head gaskets.
Estimated cost: $700-1,200
Only buy if you're getting it cheap and can wrench yourself—these need frequent, expensive engine work that quickly exceeds the car's value at shop rates.
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.