Porsche Cayman (2018)

Estimated running costs and MOT pass rates from 3,611 MOT tests in 2024.

Annual Cost

£2,413

£201/month

MOT Pass Rate

96%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 25-38

2497cc Petrol

Great Choice

96% pass rate, £2,413/year to run. 14 points above average.

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Petrol2497cc8 years old3,611 tests30k miles avg

Annual Running Costs

Fuel (Petrol, 2497cc)

~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

96% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 14 points above the average of 82% across all models in our data. It also outperforms the Porsche brand average of 92%.

96% of MOT tests on Porsche Caymans from 2018 ended in a pass in 2024, when they were about 6 years old. That's based on 3,611 tests across the UK, retests included. The average mileage recorded at those tests was 29,634 miles.

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How Does It Compare?

Rank among 2018 models73rd of 607(top 13%)

Rank among Porsche models68th of 272(top 25%)

vs average of all models+14%(82% avg)

vs 2018 models average+7%(89% avg)

vs Porsche average+4%(92% avg)

Mileage Analysis

29,634

Average miles

44,400

Expected for age

The average 2018 Porsche Cayman had 29,634 miles on the clock at its 2024 MOT, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Best Year to Buy?

Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 97%, while the 2006 model has the lowest at 86%. The 2018 scores 96%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

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

Volvo XC40

2020 · 2000cc Petrol

£2,086/year

93%

-3%

Land Rover Range Rover Sport

2018 · 2995cc Petrol

£2,413/year

93%

-3%

Mercedes GLC

2019 · 2996cc Petrol

£2,413/year

93%

-3%

Jaguar F-Pace

2017 · 1997cc Petrol

£2,086/year

90%

-6%

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About the 2018 Porsche Cayman

The 2018 Porsche Cayman is a luxury car. Our records list a 2497cc petrol engine, though engines vary between versions. 3,611 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 13% of all 2018 models for MOT pass rate.

With an average of 29,634 miles recorded at its 2024 MOT tests, Porsche Cayman owners tend to use this car less than the typical driver.

2018 Porsche Cayman Fuel Costs

The 2497cc petrol engine offers a reasonable balance between performance and economy. 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 2018 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 96% 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 2018 Porsche Cayman

At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. If you're flexible on year, the 2020 model has the highest pass rate at 97%.

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 8 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

Medium risk

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

Suspension Wear

Medium risk

Shock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.

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 2018 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(2018)	96%	£1,958	£200	Grp 25-38	£2,413
Volvo XC40(2020)	93%	£1,631	£200	Grp 18-32	£2,086-£327
Land Rover Range Rover Sport(2018)	93%	£1,958	£200	Grp 30-42	£2,413same
Mercedes GLC(2019)	93%	£1,958	£200	Grp 30-42	£2,413same
Jaguar F-Pace(2017)	90%	£1,631	£200	Grp 18-32	£2,086-£327

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 2018 Porsche Cayman

Is the 2018 Porsche Cayman reliable?

Excellent reliability. Very few MOT failures. 96% of MOT tests on 2018 Porsche Caymans ended in a pass, from 3,611 tests (DVSA MOT data for tests in 2024, retests included). That's 14 points above the average of 82% across all models in the same data.

How much does a 2018 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 2018 Porsche Cayman?

96% of 3,611 MOT tests on the 2018 Porsche Cayman ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 73rd of 607 models first registered in 2018 (top 13%).

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 2018 Porsche Cayman?

The average mileage recorded at MOT tests on the 2018 Porsche Cayman is 29,634 miles, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.