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Porsche 718 cayman gt4 vs Porsche 911: reliability comparison

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

Porsche 718 cayman gt4
97%
MOT pass rate · 737 vehicles
More reliable
Porsche 911
85%
MOT pass rate · 74,656 vehicles
Verdict: On MOT pass rate, the Porsche 718 cayman gt4 is the more reliable of the two — 97% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche 718 cayman gt4 Porsche 911
MOT pass rate 97% ✓ 85%
MOT failure rate 3% ✓ 15%
Faults & advisories per test 0.2 ✓ 1.1
Dangerous-fault share 5% 1% ✓
Average mileage 13,090 mi 70,982 mi
Sample size (vehicles) 737 74,656

Most common faults

Porsche 718 cayman gt4

  1. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  6. Offside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Porsche 911

  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. Oil leak, but not excessive (8.4.1 (a) (i))

Reliability FAQ

On MOT pass rate, the Porsche 718 cayman gt4 is the more reliable of the two — 97% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Full Porsche 718 cayman gt4 report Full Porsche 911 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.