Is the 2021 BMW 730 reliable?

Excellent reliability. Very few MOT failures. 98% of BMW 730s from 2021 passed their MOT first time in 2026, based on 243 tests. That's 16 points above the national average of 82%.

How much does a 2021 BMW 730 cost to run?

Estimated annual running cost is £1,695 (£141/month), including £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2021 BMW 730?

The 2021 BMW 730 has a 98% MOT pass rate based on 243 tests in 2026. This ranks 189 out of 3373 cars from 2021.

Which year BMW 730 is most reliable?

The 2021 BMW 730 has the highest MOT pass rate at 98%. The least reliable year is 1995 at 70%.

What is the average mileage for a 2021 BMW 730?

The average mileage for a 2021 BMW 730 is 41,849 miles, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.

BMW 730 (2021)

Running costs, reliability data, and common problems from 243 real MOT tests.

Annual Cost

£1,695

£141/month

MOT Pass Rate

98%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 30-42

2993cc Diesel

Great Choice

98% pass rate, £1695/year to run. 16 points above average.

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Diesel2993cc5 years old243 tests42k miles avg

Annual Running Costs

Fuel (Diesel, 2993cc)

~40 mpg

£1,245

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,695

Per month£141/mo

Per week£33/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

98% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 16 points above the national average of 82%. It also outperforms the BMW brand average of 88%.

At 5 years old, 98% of BMW 730s from 2021 passed their MOT first time in 2026. That's based on 243 tests across the UK. The average mileage at this age is 41,849 miles.

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How Does It Compare?

Rank among 2021 cars189th of 3,373(top 6%)

Rank among BMW models68th of 1,564(top 4%)

vs national average+16%(82% avg)

vs 2021 cars average+6%(92% avg)

vs BMW average+10%(88% avg)

Mileage Analysis

41,849

Average miles

37,000

Expected for age

The average 2021 BMW 730 has 41,849 miles on the clock, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.

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BMW 730 by Year

Year	Pass Rate	Tests	Avg Mileage
2021	98%	243	41,849 mi
2020	95%	1,033	41,493 mi
2019	95%	1,966	55,627 mi
2018	95%	1,592	67,232 mi
2017	94%	1,696	76,335 mi
2016	91%	2,288	88,853 mi
2015	89%	1,345	91,832 mi
2014	89%	1,656	97,859 mi
2013	89%	875	110,696 mi
2012	88%	1,119	115,118 mi
2011	86%	1,467	119,035 mi
2010	89%	991	128,302 mi
2009	88%	806	130,274 mi
2008	82%	1,043	138,734 mi
2007	85%	927	142,639 mi
2006	81%	1,315	141,407 mi
2005	83%	694	150,286 mi
2004	83%	322	132,666 mi
2003	88%	277	139,746 mi
1995	70%	96	129,643 mi
1994	86%	70	106,349 mi
1993	68%	37	128,018 mi
1992	81%	31	126,198 mi
1991	76%	34	141,732 mi
1990	82%	57	129,365 mi

Similar Cars to Consider

MERCEDES E

2019 · 2925cc Diesel

£1,690/year

90%

-8%

FORD RANGER

2019 · 3198cc Diesel

£1,840/year

87%

-11%

AUDI Q5

2019 · 2967cc Diesel

£1,690/year

93%

-5%

AUDI A5

2019 · 2967cc Diesel

£1,690/year

90%

-8%

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About the 2021 BMW 730

The 2021 BMW 730 is a premium performance with a 2993cc diesel engine. 243 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 6% of all 2021 cars for reliability.

With an average of 41,849 miles at 5 years old, BMW 730 owners drive about as much as the UK average.

2021 BMW 730 Fuel Costs

The 2993cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.

What does it cost to own a 2021 BMW 730?

Total estimated annual running cost is £1,695 (£141/month), broken down as £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

BMW 730 Reliability Trend

Newer BMW 730s show better MOT pass rates than older ones, with an average improvement of 8 percentage points.

Buying a Used 2021 BMW 730

At 5 years old, the BMW 730 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

Based on the 2021 BMW 730's fuel type, age, and engine size, these are the most likely problem areas to check.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Medium risk

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Low risk

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Medium risk

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

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 2021 BMW 730 stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
BMW 730(2021)	98%	£1245	£195	Grp 30-42	£1695
MERCEDES E(2019)	90%	£1245	£190	Grp 30-42	£1690-£5
FORD RANGER(2019)	87%	£1245	£190	Grp 35-50	£1840+£145
AUDI Q5(2019)	93%	£1245	£190	Grp 30-42	£1690-£5
AUDI A5(2019)	90%	£1245	£190	Grp 30-42	£1690-£5

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.