BMW M135 (2015)
Running costs, reliability data, and common problems from 59 real MOT tests.
Annual Cost
£2,277
£190/month
MOT Pass Rate
98%
Excellent
Road Tax
£430
Based on CC/year
Insurance
Grp 30-42
2979cc Petrol
Great Choice
98% pass rate, £2277/year to run. 16 points above average.
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Annual Running Costs
~30 mpg
Based on 2979cc
Low estimate due to excellent reliability
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
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 11 years old, 98% of BMW M135s from 2015 passed their MOT first time in 2026. That's based on 59 tests across the UK. The average mileage at this age is 71,060 miles.
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How Does It Compare?
Mileage Analysis
71,060
Average miles
81,400
Expected for age
The average 2015 BMW M135 has 71,060 miles on the clock, which is in line with the expected 81,400 miles for a 11-year-old car, suggesting normal everyday use.
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BMW M135 by Year
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About the 2015 BMW M135
The 2015 BMW M135 is a premium performance with a 2979cc petrol engine. 59 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 6% of all 2015 cars for reliability.
With an average of 71,060 miles at 11 years old, BMW M135 owners drive about as much as the UK average.
2015 BMW M135 Fuel Costs
The 2979cc 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 £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2015 BMW M135?
Total estimated annual running cost is £2,277 (£190/month), broken down as £1592 fuel, £430 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 M135 Reliability Trend
The BMW M135 has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2015 BMW M135
At 11 years old, the BMW M135 is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. Note: with only 59 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2015 BMW M135's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 11 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 riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
Rust and Corrosion
Watch outAt 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.
Suspension Bushings
Watch outRubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.
Service History
Low riskAlways 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 2015 BMW M135 stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW M135(2015) | 98% | £1592 | £430 | Grp 30-42 | £2277 |
| BMW 3 SERIES(2014) | 87% | £1592 | £250 | Grp 30-42 | £2247-£30 |
| VAUXHALL INSIGNIA(2013) | 79% | £1592 | £250 | Grp 30-42 | £2397+£120 |
| BMW 1 SERIES(2013) | 84% | £1592 | £250 | Grp 30-42 | £2247-£30 |
| LAND ROVER RANGE ROVER SPORT(2016) | 89% | £1592 | £250 | Grp 30-42 | £2247-£30 |
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.
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