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Porsche 356 roadster vs Porsche Boxster: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Porsche 356 roadster
88%
MOT pass rate · 3 vehicles
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Verdict: On MOT pass rate the Porsche 356 roadster (88%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 356 roadster Porsche Boxster
MOT pass rate 88% ✓ 83%
MOT failure rate 12% ✓ 17%
Faults & advisories per test 0.2 ✓ 1.4
Dangerous-fault share 0% ✓ 1%
Average mileage 43,341 mi 74,547 mi
Sample size (vehicles) 3 46,488

Most common faults

Porsche 356 roadster

  1. Offside Front Axle king pin has slight play in pin and/or bush (2.5.A.3a)
  2. Nearside Front Axle swivel joint has excessive play (2.5.A.3b)
  3. Headlamp aim beam image kick up to the offside both n/s and o/s (1.8)

Porsche Boxster

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Under-trays fitted obscuring some underside components
  4. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Porsche 356 roadster (88%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 356 roadster report Full Porsche Boxster report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.