Porsche Cayman (2020)

Estimated running costs and MOT pass rates from 1,421 MOT tests in 2024.

Annual Cost

£2,413

£201/month

MOT Pass Rate

97%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 35-50

3995cc Petrol

Great Choice

97% pass rate, £2,413/year to run. 15 points above average.

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Petrol3995cc6 years old1,421 tests17k miles avg

Annual Running Costs

Fuel (Petrol, 3995cc)

~30 mpg

£1,958

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,413

Per month£201/mo

Per week£46/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

97% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 15 points above the average of 82% across all models in our data. It also outperforms the Porsche brand average of 92%.

97% of MOT tests on Porsche Caymans from 2020 ended in a pass in 2024, when they were about 4 years old. That's based on 1,421 tests across the UK, retests included. The average mileage recorded at those tests was 17,106 miles.

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How Does It Compare?

Rank among 2020 models181st of 2,554(top 8%)

Rank among Porsche models48th of 272(top 18%)

vs average of all models+15%(82% avg)

vs 2020 models average+5%(92% avg)

vs Porsche average+5%(92% avg)

Mileage Analysis

17,106

Average miles

29,600

Expected for age

The average 2020 Porsche Cayman had 17,106 miles on the clock at its 2024 MOT, which is below the expected 29,600 miles for a 4-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Porsche Cayman by Year

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

Similar Cars to Consider

Mercedes C

2019 · 3982cc Petrol

£2,413/year

91%

-6%

Porsche Cayenne

2019 · 3996cc Petrol

£2,413/year

95%

-2%

Porsche 911

2018 · 3996cc Petrol

£2,413/year

96%

-1%

Audi A6

2020 · 3996cc Petrol

£2,413/year

94%

-3%

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About the 2020 Porsche Cayman

The 2020 Porsche Cayman is a luxury car. Our records list a 3995cc petrol engine, though engines vary between versions. 1,421 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 8% of all 2020 models for MOT pass rate.

With an average of 17,106 miles recorded at its 2024 MOT tests, Porsche Cayman owners tend to use this car less than the typical driver.

2020 Porsche Cayman Fuel Costs

The 3995cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2020 Porsche Cayman?

Total estimated annual running cost is £2,413 (£201/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 97% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Porsche Cayman 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.

Buying a Used 2020 Porsche Cayman

At 6 years old, the Porsche Cayman offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Timing Chain / Belt

Watch out

At 6 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Low risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2020 Porsche Cayman stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Porsche Cayman(2020)	97%	£1,958	£200	Grp 35-50	£2,413
Mercedes C(2019)	91%	£1,958	£200	Grp 35-50	£2,413same
Porsche Cayenne(2019)	95%	£1,958	£200	Grp 35-50	£2,413same
Porsche 911(2018)	96%	£1,958	£200	Grp 35-50	£2,413same
Audi A6(2020)	94%	£1,958	£200	Grp 35-50	£2,413same

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2020 Porsche Cayman

Is the 2020 Porsche Cayman reliable?

Excellent reliability. Very few MOT failures. 97% of MOT tests on 2020 Porsche Caymans ended in a pass, from 1,421 tests (DVSA MOT data for tests in 2024, retests included). That's 15 points above the average of 82% across all models in the same data.

How much does a 2020 Porsche Cayman cost to run?

Our estimate is £2,413 a year (£201 a month): £1,958 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2020 Porsche Cayman?

97% of 1,421 MOT tests on the 2020 Porsche Cayman ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 181st of 2,554 models first registered in 2020 (top 8%).

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% and the 2006 the lowest at 86%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2020 Porsche Cayman?

The average mileage recorded at MOT tests on the 2020 Porsche Cayman is 17,106 miles, which is below the expected 29,600 miles for a 4-year-old car. This suggests lighter use than average, which generally means less wear on major components.