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BMW N20 vs 2.3 MZR DISI Turbo: which engine is more reliable?

The BMW N20 and the 2.3 MZR DISI Turbo tie on our risk index: 63/100 (high risk). The BMW N20 has 2 documented serious faults, the main one being «Timing chain guide and tensioner wear (2011-2015)»; the 2.3 MZR DISI Turbo has 2 documented serious faults, the main one being «Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo».

Risk index

BMW N20

63

High risk · 2 serious faults

Risk index

2.3 MZR DISI Turbo

63

High risk · 2 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

7 sourcesHow we work

Is the BMW N20 reliable?

The BMW N20 (2011-2017) was the first turbocharged four-cylinder with which BMW replaced its naturally aspirated six-cylinders in models such as the 320i, 328i and X3, and it is generally mechanically sound. Its best-documented weak point is the timing chain guides and tensioner on units built before 2015; oil leaks, the electric water pump and, to a lesser extent, the turbo and the high-pressure fuel pump are also known issues.[1][2]

See the 5 of the BMW N20 faults

Is the 2.3 MZR DISI Turbo reliable?

Mazda's 2.3 DISI Turbo (L3-VDT, 2005-2013) is powerful but demanding: the timing chain, the turbo and oil sludge are its weak points; only buy one with a good oil service history.[3][4][5]

See the 3 of the 2.3 MZR DISI Turbo faults

Side-by-side comparison

Comparison of BMW N20 and 2.3 MZR DISI Turbo
BMW N202.3 MZR DISI Turbo
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,997 cm³2,261 cm³
TimingChainChain
Power156–245 hp256–263 hp
Production2011–2017[1][6]2005–2013[3][7]
Reliability
Risk index (what is it?)63High risk63High risk
Documented faults53
Of high or critical severity22
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: Timing chain guide and tensioner wear (2011-2015)
  2. Critical severity: Electric water pump failure (BMW campaign in the US over fire risk)
  3. Medium severity: Oil leaks from the rocker cover gasket and the filter housing
  1. Critical severity: Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo
  2. High severity: Premature turbocharger wear from poor lubrication on the 2.3 DISI Turbo
  3. Medium severity: Oil consumption and sludge in the 2.3 DISI Turbo engine
Most expensive documented repairNo reliable dataup to €2,200Premature turbocharger wear from poor lubrication on the 2.3 DISI TurboPublished figure[4]
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • N20B20 156 hp (115 kW, 2013-2016)[2]
  • N20B20B 184 hp (135 kW, 2011-2017)[2]
  • N20B20 218 hp (160 kW, 2012-2015)[2]
  • N20B20A 245 hp (180 kW, 2011-2017)[2]
  • 2.3 MZR DISI Turbo 256-260 hp (L3-VDT, 2005-2009)[3][4]
  • 2.3 MZR DISI Turbo (L3-VDT, 2010-2013)[3][4]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

BMW N20

See the 8 models with the BMW N20

2.3 MZR DISI Turbo

Other comparisons

With the BMW N20

With the 2.3 MZR DISI Turbo

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW N20Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. BMW N20 Engine: Pros, Cons, Reliability, Tuning, and Maintenance GuideBMW BLOG · Motoring press · published 8 June 2025 · consulted 27 September 2026
  3. Mazda L engineWikipedia (inglés) · Other source · consulted 5 October 2026
  4. Problemas Mazda CX-7Totalrenting · Other source · consulted 5 October 2026 · in Spanish
  5. 2009 Mazda CX-7 engine problemsCarComplaints · Owners' forum · consulted 5 October 2026
  6. BMW N20Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  7. Mazda CX-7Wikipedia (inglés) · Other source · consulted 5 October 2026