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BMW B58 vs 1.5 VTi-TECH / T-GDI: which engine is more reliable?

According to our risk index, the 1.5 VTi-TECH / T-GDI carries less risk than the BMW B58: 7/100 (low risk) versus 38/100 (moderate risk). The BMW B58 has 1 documented serious fault, the main one being «Failure of the oil pump with a plastic rotor housing»; the 1.5 VTi-TECH / T-GDI has no documented serious faults.

Risk index

BMW B58

38

Moderate risk · 1 serious fault

Risk index

1.5 VTi-TECH / T-GDI

7

Low risk · 0 serious faults

Lower risk

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

16 sourcesHow we work

Is the BMW B58 reliable?

The B58 (3.0 turbo straight-six, since 2015) is considered robust and less troublesome than the N54/N55 it replaced, and the sources do not document widespread internal failures. The known faults are on the periphery: the plastic oil filter housing, crankcase ventilation, gaskets and coolant. On units built before 2021 there are also US reports of an oil pump with a plastic housing.[1][2][3][4]

See the 6 of the BMW B58 faults

Is the 1.5 VTi-TECH / T-GDI reliable?

MG/SAIC's "1.5" covers two different engines: the naturally aspirated VTi-TECH (106 hp), the entry-level engine in the MG ZS, and the turbocharged T-GDI (162-170 hp), found only in the MG HS and as the petrol engine in its plug-in hybrids. Neither has well-documented engine faults in independent sources yet: the complaints published concern electronics, the automatic gearbox and finish, not the engine block.[5][6][7][8][9][10]

See the 2 of the 1.5 VTi-TECH / T-GDI faults

Side-by-side comparison

Comparison of BMW B58 and 1.5 VTi-TECH / T-GDI
BMW B581.5 VTi-TECH / T-GDI
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement2,998 cm³—
TimingChainChain
Power290–441 hp106–170 hp
Productionsince 2015[11][12]since 2017[5][6][13][14][15]
Reliability
Risk index (what is it?)38Moderate risk7Low risk
Documented faults62
Of high or critical severity10
Worst severityHigh severityLow severity
Main faults
  1. High severity: Failure of the oil pump with a plastic rotor housing
  2. Medium severity: Oil and coolant leak from the plastic oil filter housing
  3. Medium severity: Failure of the crankcase ventilation PCV valve (integrated in the valve cover)
  1. Low severity: Jerky or harsh automatic gearbox shifts when cold or at low speed (MG HS)
  2. Low severity: Electronic warnings and occasional sensor faults (MG HS)
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • B58TU2 381 hp (B58B30M2, since 2022)[2][3]
  • 1.5 VTi-TECH naturally aspirated 106 hp (NSE / NSE Plus, from 2017)[8]
With cautionVersions to be cautious about
  • B58 326 hp (B58B30M0, 2015-2019)[2][3][16]
  • B58 340-360 hp (B58B30M0, 2016-2019)[2][3][16]
  • B58TU 333-340 hp (B58B30M1, since 2018)[2][3]
  • B58TU 374 hp (B58B30O1, M340i, M440i and M240i, since 2019)[3]
  • 1.5 T-GDI turbo 162 hp (GS61H, 2018-2024)[9][10]
  • 1.5 T-GDI turbo 170 hp (15FDE / 15FKE, from 2024)[6]
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 B58

See the 15 models with the BMW B58

1.5 VTi-TECH / T-GDI

Other comparisons

With the BMW B58

With the 1.5 VTi-TECH / T-GDI

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. The 5 Most Common BMW B58 Engine ProblemsBMW Tuning · Technical documentation · published 7 February 2020 · consulted 9 October 2026
  2. BMW B58 EngineFCP Euro · Technical documentation · consulted 9 October 2026
  3. The Popular BMW B58 Inline-Six Engine Has One Big Achilles HeelThe Autopian · Motoring press · published 14 June 2024 · consulted 9 October 2026
  4. ¿En qué se diferencian los motores B58 y S58 de BMW?Diariomotor · Motoring press · published 27 April 2024 · consulted 9 October 2026 · in Spanish
  5. MG ZS (crossover)Wikipedia (inglés) · Other source · consulted 27 September 2026
  6. MG HSWikipedia (inglés) · Other source · consulted 27 September 2026
  7. Essai complet : MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  8. Fiabilité et pannes du MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  9. Fiabilité et pannes du MG eHSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  10. MG HS PHEV: guía definitiva de problemas y soluciones del SUV, el híbrido enchufable más vendidoAutopista.es · Motoring press · published 10 November 2025 · consulted 27 September 2026 · in Spanish
  11. BMW B58Wikipedia (inglés) · Other source · consulted 9 October 2026
  12. BMW B58Wikipedia (alemán) · Other source · consulted 9 October 2026 · in German
  13. MG HSWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  14. MG HSWikipedia (francés) · Other source · consulted 27 September 2026 · in French
  15. List of General Motors enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  16. How A Plastic Part On BMW's B58 Engine Can Turn An Oil Change Into A $3,000 RepairThe Autopian · Motoring press · published 28 March 2025 · consulted 9 October 2026