Porsche 911 (2018)

Estimated running costs and MOT pass rates from 7,623 MOT tests in 2024.

Annual Cost

£2,413

£201/month

MOT Pass Rate

96%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 35-50

3996cc Petrol

Great Choice

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

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Petrol3996cc8 years old7,623 tests19k miles avg

Annual Running Costs

Fuel (Petrol, 3996cc)

~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 911s from 2018 ended in a pass in 2024, when they were about 6 years old. That's based on 7,623 tests across the UK, retests included. The average mileage recorded at those tests was 18,989 miles.

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How Does It Compare?

Rank among 2018 models72nd of 607(top 12%)

Rank among Porsche models65th of 272(top 24%)

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

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

vs Porsche average+4%(92% avg)

Mileage Analysis

18,989

Average miles

44,400

Expected for age

The average 2018 Porsche 911 had 18,989 miles on the clock at its 2024 MOT, which is significantly below the expected 44,400 miles for a 6-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

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Best Year to Buy?

Of the years with at least 100 tests, the 2019 model has the highest MOT pass rate at 97%, while the 1998 model has the lowest at 85%. The 2018 scores 96%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Porsche 911 by Year

Year	Pass Rate	Tests	Avg Mileage
2021	100%	72	11,708 mi
2020	97%	2,366	17,049 mi
2019	97%	7,188	20,907 mi
2018	96%	7,623	18,989 mi
2017	97%	6,200	26,067 mi
2016	97%	5,524	28,111 mi
2015	97%	4,950	32,698 mi
2014	96%	4,806	32,843 mi
2013	96%	3,535	43,937 mi
2012	95%	4,253	50,959 mi
2011	95%	2,580	43,837 mi
2010	94%	3,656	49,709 mi
2009	92%	3,055	59,885 mi
2008	92%	4,216	58,132 mi
2007	90%	5,366	62,566 mi
2006	90%	6,184	70,206 mi
2005	90%	5,986	73,824 mi
2004	88%	5,191	74,425 mi
2003	87%	5,168	82,296 mi
2002	86%	4,972	84,310 mi
2001	88%	2,885	87,628 mi
2000	86%	2,099	90,453 mi
1999	87%	3,668	94,086 mi
1998	85%	3,337	99,008 mi
1997	90%	2,103	76,331 mi
1996	91%	2,651	80,487 mi
1995	89%	1,831	80,965 mi
1994	91%	1,473	95,559 mi
1993	91%	698	89,736 mi
1992	94%	611	81,375 mi
1991	91%	929	81,480 mi
1990	91%	1,888	94,950 mi

Similar Cars to Consider

Mercedes C

2016 · 3982cc Petrol

£3,153/year

88%

-8%

Audi A6

2016 · 3993cc Petrol

£3,153/year

89%

-7%

Porsche Cayenne

2019 · 3996cc Petrol

£2,413/year

95%

-1%

BMW X6

2017 · 4395cc Petrol

£2,413/year

92%

-4%

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About the 2018 Porsche 911

The 2018 Porsche 911 is a luxury car. Our records list a 3996cc petrol engine, though engines vary between versions. 7,623 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 12% of all 2018 models for MOT pass rate.

With an average of 18,989 miles recorded at its 2024 MOT tests, Porsche 911 owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.

2018 Porsche 911 Fuel Costs

The 3996cc 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 2018 Porsche 911?

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 911 Reliability Trend

Newer Porsche 911s 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 911

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 2019 model has the highest pass rate at 97%. With 7,623 MOT tests in our data, there's strong statistical confidence in these figures.

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 911 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 911(2018)	96%	£1,958	£200	Grp 35-50	£2,413
Mercedes C(2016)	88%	£1,958	£790	Grp 35-50	£3,153+£740
Audi A6(2016)	89%	£1,958	£790	Grp 35-50	£3,153+£740
Porsche Cayenne(2019)	95%	£1,958	£200	Grp 35-50	£2,413same
BMW X6(2017)	92%	£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 2018 Porsche 911

Is the 2018 Porsche 911 reliable?

Excellent reliability. Very few MOT failures. 96% of MOT tests on 2018 Porsche 911s ended in a pass, from 7,623 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 911 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 911?

96% of 7,623 MOT tests on the 2018 Porsche 911 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 72nd of 607 models first registered in 2018 (top 12%).

Which year Porsche 911 has the best MOT pass rate?

Of the years with at least 100 tests, the 2019 Porsche 911 has the highest MOT pass rate at 97% and the 1998 the lowest at 85%. 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 911?

The average mileage recorded at MOT tests on the 2018 Porsche 911 is 18,989 miles, which is significantly below the expected 44,400 miles for a 6-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.