Porsche Cayman

Reliability, estimated running costs, and MOT data across 18 model years from 36,158 MOT tests in 2024.

Avg Pass Rate

94%

Total Tests

36,158

Highest Pass Rate

2020 (97%)

Years Covered

About the Porsche Cayman

The Porsche Cayman was MOT tested 36,158 times in 2024 (DVSA data, retests included) across 18 model years (2005 to 2022), with an average pass rate of 94%. That's comfortably above the average of 82% across all models in our data. Our records list petrol versions.

Best and Worst Years

Of the years with at least 100 tests, the 2020 model has the highest pass rate at 97% from 1,421 tests. The 2006 model has the lowest at 86%. The 11 point gap means pass rates vary somewhat between years, but no year is dramatically different. Newer cars usually pass more often simply because they are younger.

Reliability Trend

Newer Porsche Caymans pass their MOT more often than older ones, by 5 percentage points on average, which is mostly down to age and wear.

Mileage Across Years

The oldest model in our data (2005) averages 84,339 miles, while the newest (2022) averages 10,562 miles.

Estimated Running Costs

Fuel (Petrol, 1988cc)

£1,631

Road Tax

£200

MOT Test

£55

Predicted Repairs

£200

Total per year£2,086

Per month£174/mo

Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.

Full 2022 details

How reliable is the Porsche Cayman?

vs average of all models+12% (82% avg)

vs Porsche brand average+2% (92% avg)

Best to worst year spread11 percentage points

Reliability trendImproving over years

Porsche Cayman by Year

Click any year to see detailed running costs, reliability data, and comparisons with similar cars.

Year	Pass Rate	Tests	Avg Mileage
2022	100%	60	10,562 mi
2021	97%	1,230	16,318 mi
2020	97%	1,421	17,106 mi
2019	95%	2,635	23,973 mi
2018	96%	3,611	29,634 mi
2017	95%	2,747	32,888 mi
2016	96%	2,725	30,854 mi
2015	96%	2,774	36,438 mi
2014	94%	2,963	49,014 mi
2013	95%	2,270	50,622 mi
2012	96%	691	51,012 mi
2011	92%	1,167	54,736 mi
2010	90%	1,201	67,244 mi
2009	93%	1,466	67,126 mi
2008	89%	2,312	74,137 mi
2007	88%	3,100	77,221 mi
2006	86%	3,424	80,301 mi
2005	89%	361	84,339 mi

Questions about the Porsche Cayman

Is the Porsche Cayman reliable?

Across its 18 model years in our data (2005 to 2022), the Porsche Cayman averages a 94% MOT pass rate, from 36,158 tests (DVSA MOT data for tests in 2024, retests included). That's 12 points above the average of 82% across all models in the same data. The 2020 model has the highest pass rate of the years with at least 100 tests, at 97%.

Which year Porsche Cayman has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Porsche Cayman has the highest MOT pass rate at 97%, while the 2006 model has the lowest at 86%, a 11 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.