The 2024 Morgan Plus Four uses a BMW B48 2.0L turbo four mated to a ZF 8-speed automatic in a hand-built British chassis. Most issues trace to BMW powertrain components and Morgan's bespoke cooling/mounting solutions rather than the traditional Morgan concerns.
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 15,000-40,000 mi
Symptoms: ATF puddles under vehicle center-front, Transmission overheat warnings on spirited drives, Low fluid level on dipstick check
Fix: Morgan routes cooler lines in tight confines near exhaust; vibration and heat cause premature line failure. Replacement requires dropping undertray and sometimes front suspension crossmember for access. 3-4 hours labor plus fluid refill and system flush.
Estimated cost: $800-1,400
Transmission Mount Failure
Common · medium severityTypical onset: 20,000-50,000 mi
Symptoms: Clunking on hard acceleration or deceleration, Excessive drivetrain movement felt through shifter, Vibration at idle that worsens over time
Fix: The custom transmission mount design for this chassis doesn't handle BMW torque delivery well. Rubber deteriorates faster than OEM BMW applications. Replacement is straightforward but requires transmission support—2 hours labor. Morgan-specific part costs more than BMW equivalent.
Estimated cost: $450-750
B48 Cylinder Head Coolant Passage Cracking
Rare · high severityTypical onset: 30,000-60,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Overheating under sustained load, Milky oil on dipstick in severe cases
Fix: Known BMW B48 defect exacerbated by Morgan's tighter engine bay cooling. Head removal, resurface or replacement, new gaskets, timing chain verification. 18-24 hours labor depending on head condition. Often covered under BMW powertrain warranty if within coverage period.
Estimated cost: $4,500-7,500
Fuel Filter Clogging (Ethanol-Related)
Occasional · low severitySymptoms: Hesitation or stumble during acceleration, Hard starting after sitting several days, Limp mode activation under full throttle
Fix: Morgan fuel system sits closer to heat sources than typical BMW installation; ethanol fuel degrades faster. Filter element clogs prematurely. Replacement is simple—1 hour labor—but Morgan specifies more frequent service interval (15k mi vs BMW's 30k).
Estimated cost: $200-350
ZF 8HP Mechatronic Sleeve Wear
Rare · high severityTypical onset: 50,000-80,000 mi
Symptoms: Harsh 2-3 or 3-4 shifts when cold, Transmission slip or flare during upshifts, Check engine light with P0796 or P0776 codes
Fix: The ZF 8HP45 in this application experiences accelerated mechatronic sleeve wear—likely due to heat and Morgan's aggressive tune. Requires transmission removal, mechatronic unit rebuild or replacement. 12-16 hours labor. Sometimes full rebuild is more cost-effective.
Estimated cost: $3,500-6,000
Headlight Assembly Condensation and Seal Failure
Common · low severitySymptoms: Visible moisture inside headlight lens, Intermittent bulb failure, Corrosion on bulb sockets
Fix: Morgan's headlight sealing is marginal—hand-built tolerances mean inconsistent gasket compression. Water intrusion damages electronics and corrodes sockets. Seal replacement attempted first (1 hour), but often full assembly replacement needed. Morgan-specific parts are expensive.
Estimated cost: $400-1,200
Buy for the driving experience, not reliability—expect higher maintenance costs than a standard BMW and budget for transmission-related repairs before 60k miles.
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.