BMW 4 Series vs Porsche 911

Both are coupés & GTs. First-time MOT failure at age 7, and what each one is known to fail on.

The Porsche 911 is the more reliable of the two. It fails its first MOT at age 7 5.7% of the time, against 15.2% for the BMW 4 Series.

BMW 4 Series

15.2%

fail at age 7

Rank 59 of 239 · 63k miles at 7 · 119,232 tests

Porsche 911

5.7%

fail at age 7

Rank 3 of 239 · 24k miles at 7 · 22,079 tests

What each one fails on

Measured

The faults each records most at ages 6 to 9. Same figures as each full report.

A suspension pin, bush or joint excessively wornAdvisory4.7%

Play in steering rack inner joint(s)Advisory3.9%

A shock absorber damaged to the extent that it does not function or showing signs of severe leakageAdvisory3.2%

Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road usersAdvisory2.6%

A shock absorber damaged to the extent that it does not function or showing signs of severe leakageFail1.1%

A wheel badly distorted or wear between wheel and hub at spigot mountingAdvisory0.8%

Brake pipe damaged or excessively corrodedAdvisory0.7%

Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road usersAdvisory0.6%

A suspension pin, bush or joint excessively wornAdvisory0.5%

A spring or spring component fractured or seriously weakenedAdvisory0.4%

Coolant leakAdvisory0.4%

A shock absorber damaged to the extent that it does not function or showing signs of severe leakageAdvisory0.3%