M50 and M52 vs E-Tech Híbrido: which engine is more reliable?

According to our risk index, the E-Tech Híbrido carries less risk than the M50 and M52: 32/100 (moderate risk) versus 52/100 (high risk). The M50 and M52 has 2 documented serious faults, the main one being «Cooling system failure (expansion tank, thermostat, pump and radiator)»; the E-Tech Híbrido has 2 documented serious faults, the main one being «Multi-mode gearbox failure (risk of breakage)».

Risk index

M50 and M52

High risk · 2 serious faults

Risk index

E-Tech Híbrido

Moderate risk · 2 serious faults

Lower risk

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

Reviewed on 2 November 202618 sources How we work

Is the M50 and M52 reliable?

The M52 and its predecessor the M50 are six-cylinder petrol engines that the sources describe as durable: Enginescope considers 300,000 km routine with the cooling circuit looked after. Watch the plastic cooling parts, VANOS, crankcase ventilation and oil leaks and, in the aluminium-block M52s built from 1995 to March 1998, cylinder wear caused by sulphur (Nikasil).^[1][2][3]

See the 5 of the M50 and M52 faults

Is the E-Tech Híbrido reliable?

The E-Tech combines a combustion engine (1.6 H4M naturally aspirated or 1.2 HR12 turbo) with electric motors and a multi-mode gearbox with no clutch or torque converter. Its best-documented weak point is the gearbox itself: reports from the Clio, Captur, Arkana, Austral, Duster and Jogger describe warnings of a risk of breakage, and Renault has launched two campaigns since 2020 (an electrical fault and a primary shaft seal). The 12 V battery also fails fairly often.^[4][5][6]

See the 4 of the E-Tech Híbrido faults

Side-by-side comparison

Comparison of M50 and M52 and E-Tech Híbrido
Item	M50 and M52	E-Tech Híbrido
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	—	1,598 cm³
Timing	Chain	Chain
Power	150–193 hp	140–200 hp
Production	1990–2001^{[7][8][9][10]}	since 2020^[4][11][12]
Reliability
Risk index (what is it?)	52High risk	32Moderate risk
Documented faults	5	4
Of high or critical severity	2	2
Worst severity	Critical severity	High severity
Main faults	High severity: Cooling system failure (expansion tank, thermostat, pump and radiator) Critical severity: Premature cylinder wear (Nikasil coating) Medium severity: Worn VANOS seals	High severity: Multi-mode gearbox failure (risk of breakage) High severity: Stalling and injection warnings on the 1.2 E-Tech 200 (HR12) Medium severity: Hybrid system electrical fault with "DANGER" warning and car won't start
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	M50B20, 2.0 litre (150 hp; 1990-1995)^[13][14] M50B25, 2.5 litre (192 hp; 1990-1995)^[13][14] M52B20, 2.0 litre (150 hp; 1994-1999)^[8][13] M52B25, 2.5 litre (170 hp; 1995-1999)^[8][13] M52B28, 2.8 litre (193 hp; 1995-1999)^[8][13][15] M52TUB20, 2.0 litre (150 hp; 1998-2001)^[7][13] M52TUB25, 2.5 litre (170 hp; 1998-2000)^[7][13] M52TUB28, 2.8 litre (193 hp; 1998-2001)^[3][7][13]	1.6 E-Tech Full Hybrid 140-145 (H4M, 2020+)^[5][16] 1.6 E-Tech Plug-in Hybrid 160 (H4M, 2020-2023)^[17] 1.2 E-Tech Full Hybrid 200 (HR12 turbo, 2022+)^[6][18]
AvoidVersions to avoid	None	None

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

Cars that each one is fitted to

M50 and M52

E-Tech Híbrido

See the 12 models with the E-Tech Híbrido

Other comparisons

With the M50 and M52

With the E-Tech Híbrido

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Sources

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

BMW 3 Series E36 320i (M52B20): reliabilityEnginescope · Other source · consulted 2 November 2026
BMW M52 reliabilityAutoscore · Other source · consulted 2 November 2026
BMW M52 Engine: Performance, Reliability, and TuningBMWBlog · Motoring press · consulted 2 November 2026
Renault Clio VWikipedia (francés) · Other source · consulted 27 September 2026 · in French
Fiabilité et pannes de la Renault Clio 5Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du Renault AustralFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
BMW M52Wikipedia (inglés) · Other source · consulted 2 November 2026
BMW M52Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
BMW M50Wikipedia (inglés) · Other source · consulted 2 November 2026
BMW M50Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
Renault Captur IIWikipedia (francés) · Other source · consulted 27 September 2026 · in French
Renault AustralWikipedia (inglés) · Other source · consulted 27 September 2026
BMW M50 / M52: problemas conocidosEnginescope · Other source · consulted 2 November 2026
Der BMW M50 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki.de · Other source · consulted 2 November 2026 · in German
BMW Z3 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026
Fiabilité et pannes du Renault ArkanaFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du Renault Captur IIFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du Renault Espace 6Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French