The 2023 Morgan Plus Six uses BMW's B58 3.0L turbo inline-six mated to a ZF 8-speed automatic, wrapped in a hand-built aluminum body on a bonded aluminum platform. It's essentially BMW G29 Z4 mechanicals in a bespoke British package, so most problems trace back to BMW components and Morgan's low-volume assembly quirks.
Transmission Mount Failure (Front and Rear)
Occasional · medium severityTypical onset: 15,000-35,000 mi
Symptoms: Clunking on hard acceleration or deceleration, Vibration through chassis at idle, Excessive driveline lash when reversing direction
Fix: Replace both front and rear transmission mounts. These are BMW Z4 parts but fitment in the Morgan chassis is tight, adding labor. Expect 3-4 hours with proper lift access. Early-production 2023s seem more prone due to mount spec changes.
Estimated cost: $800-1,400
Transmission Oil Cooler Line Seepage
Occasional · medium severitySymptoms: Small transmission fluid spots under vehicle, Slight burning smell after spirited driving, Low transmission fluid warning on early detection
Fix: ZF 8HP trans cooler lines can weep at crimp fittings or where they route near exhaust. Morgan's tight engine bay means lines run closer to heat sources than in a Z4. Replace affected lines and top off fluid, 2-3 hours labor. Verify no heat damage to nearby wiring.
Estimated cost: $600-1,000
LED Headlight Module Moisture Intrusion
Common · low severitySymptoms: Condensation visible inside headlight lens, Intermittent headlight flicker or failure, Corrosion on LED driver board
Fix: Morgan's headlight assemblies are custom units with marginal sealing. Water gets past gaskets during washing or rain. Often requires complete headlight assembly replacement as modules aren't serviceable separately. 1.5-2 hours per side, but parts availability is poor—expect weeks for Morgan UK to ship.
Estimated cost: $1,800-2,800 per side
Fuel Filter Clogging (Premature)
Occasional · medium severityTypical onset: 20,000-40,000 mi
Symptoms: Rough idle when tank is below 1/4, Hesitation or stumble under load, P0087 fuel rail pressure low code
Fix: The in-tank fuel pump filter on these clogs earlier than BMW spec suggests, likely due to Morgan's fuel tank fabrication leaving debris or inadequate pre-delivery fuel system flushing. Drop tank, replace filter and inspect pump screen. 3-4 hours labor due to rear body access panels.
Estimated cost: $700-1,100
Cylinder Head Valve Cover Oil Seepage
Occasional · low severityTypical onset: 30,000-60,000 mi
Symptoms: Oil smell in cabin with heater on, Light oil weeping at valve cover perimeter, Oil residue on exhaust manifold
Fix: B58 valve cover gaskets weep with heat cycling, common across BMW applications but the Morgan's compact engine bay runs hotter. Replace valve cover gasket and reseal PCV ports. 4-5 hours due to tight access around custom engine mounts and body panels. Use BMW OEM gasket only.
Estimated cost: $900-1,500
Fuse Box Corrosion (Engine Bay)
Occasional · medium severitySymptoms: Intermittent electrical gremlins, Multiple systems dropping out simultaneously, Green corrosion visible on fuse terminals
Fix: Engine bay fuse box on firewall is splash-shielded but not sealed as well as mass-production cars. Water intrusion during heavy rain or washing. Clean terminals with contact cleaner and dielectric grease, or replace fuse box if corrosion is severe. 2-3 hours to R&R and rewire affected circuits.
Estimated cost: $500-1,200
Check Engine Light - High-Pressure Fuel Pump Sensor Drift
Occasional · low severityTypical onset: 25,000-50,000 mi
Symptoms: P0191 or P0193 fuel pressure sensor codes, No actual driveability issues, CEL appears after extended highway runs
Fix: B58 high-pressure fuel pump sensor is heat-sensitive and the Morgan's exhaust routing puts more radiant heat on it than the Z4. Replace sensor (not the pump), 1 hour labor. BMW part, readily available. Clear adaptation values after replacement.
Estimated cost: $300-500
Buy it if you want the BMW B58's reliability in a unique package, but factor in $2-3k annual repairs beyond maintenance and accept parts delays—this is a hand-built exotic with mass-production guts, not a mass-production car with exotic styling.
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.