BMW M50 and M52 (seis cilindros en línea de gasolina, 2.0 / 2.5 / 2.8)Variable valve timing (VVT) actuator
Worn VANOS seals on the M50 and M52
Why this rating?
Medium severity: It can leave you stranded or get worse if ignored, without destroying the engine.
Frequency common: BMW Tuning, BMWBlog, Enginescope, CarWiki and the Euro Premium Parts guides for the E36, E39 and Z3 all record it as a common fault. None gives fleet statistics. The mileages differ: Enginescope gives 120,000-200,000 km, and the Euro Premium Parts guides 60,000-100,000 miles on the E39 (97,000-161,000 km).[1][2][3][4][5][6][7]
Symptoms
- Loss of power and torque, especially at low revs, according to BMW Tuning and Enginescope.[1][3]Less power: other faults that cause it · Monitor
- Higher fuel consumption, according to BMWBlog and CarWiki.[2][6]Uses more fuel: other faults that cause it · Monitor
- Rough idle and, according to Enginescope, a rattle after a cold start.[1][3]Vibrations: other faults that cause it · Monitor
Why it happens
The internal VANOS seals harden over the years and stop sealing, according to Enginescope; the Euro Premium Parts E39 guide adds wear of the solenoid valve.[2][3][5]
If it is not repaired: The sources describe it as a minor or moderate fault: the car loses torque and uses more fuel, and they do not cite serious mechanical damage caused by the VANOS itself.[3][5]
Affected cars and years
It is cited for both the single-VANOS M52 and the double-VANOS M52TU; Enginescope adds the M50 from the 1992 TU update, which introduced it. BMW Tuning says it is more common on early engines.[1][3]
| Version | Years | Codes |
|---|---|---|
| M50B20, 2.0 litre (150 hp; 1990-1995) | 1990–1995 | M50B20M50B20TU |
| M50B25, 2.5 litre (192 hp; 1990-1995) | 1990–1995 | M50B25M50B25TU |
| M52B20, 2.0 litre (150 hp; 1994-1999) | 1994–1999 | M52B20 |
| M52B25, 2.5 litre (170 hp; 1995-1999) | 1995–1999 | M52B25 |
| M52B28, 2.8 litre (193 hp; 1995-1999) | 1995–1999 | M52B28 |
| M52TUB20, 2.0 litre (150 hp; 1998-2001) | 1998–2001 | M52TUB20M52B20TU |
| M52TUB25, 2.5 litre (170 hp; 1998-2000) | 1998–2000 | M52TUB25M52B25TU |
| M52TUB28, 2.8 litre (193 hp; 1998-2001) | 1998–2001 | M52TUB28M52B28TU |
Models fitted with the affected versions
BMW
- BMW Serie 3 E361990–2000
- BMW Serie 3 E461998–2001
- BMW Serie 5 E391995–2001
- BMW Z3 E36/71997–2001
- BMW Serie 5 E341990–1996
- BMW Serie 7 E381995–2001
How much it costs to repair
Includes: VANOS seal kit with removal and refitting of the unit, or replacement of the complete unit.[3][4]
No price for Spain: Enginescope gives €80-200 without specifying country or VAT, and the Euro Premium Parts Z3 guide $500-900 at an independent workshop.
Prices in Spain, including VAT. A workshop hour costs on average €38–66 at independent garages and €77–134 at dealerships in Spain, depending on the region and the brand. How we calculate costs
How to check for it before buying a used car
Parts needed
The part or kit that fixes this fault, according to the sources.
Seals that keep the VANOS unit sealed; they are changed when it is dismantled.
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Recalls, campaigns and claims
As of 2 November 2026, we have no record of recalls, campaigns or extended manufacturer warranties for this fault. Check with an official dealer using the chassis (VIN) number: they will tell you whether the car has any outstanding campaign.
What owners say
Frequently asked questions
Can the M52’s VANOS be fixed without changing the unit?
Yes: BMWBlog suggests replacing the seals, and the Euro Premium Parts E39 guide describes a repair kit as a known solution, although BMW Tuning warns that special tools are needed.[1][2][5]
What can you do now?
We will put you in touch with a partner only if you authorise it in the form.
Other M50 and M52 faults
- High severityFrequency: CommonCoolingCooling system failure (expansion tank, thermostat, pump and radiator)The most cited weak point of the M52: the expansion tank, the thermostat housing, the pump impeller and the radiator tanks are plastic and crack with age. If coolant is lost and the engine overheats, the cylinder head can be damaged.Appears at around 97,000 km
- Critical severityFrequency: OccasionalCylinder head and blockPremature cylinder wear (Nikasil coating)Some aluminium-block M52s with Nikasil-coated cylinders, built between 1995 and March 1998, suffered premature wear from sulphur in the fuel and lost compression. BMW moved to iron liners in 1998, and the M52TU had them as standard.
- Medium severityFrequency: CommonLubricationOil leaks from the rocker cover, oil filter housing and other gasketsWith age the M52’s rubber gaskets harden: the most cited are the rocker cover gasket and the oil filter housing gasket, and on some M52TUs the plastic cover itself cracks. They should be watched so the oil level does not drop.
- Medium severityFrequency: OccasionalLubricationBlocked crankcase ventilation valve (CCV) and oil consumptionThe crankcase ventilation valve (CCV) and its hoses clog or break over the years: the engine uses more oil, the idle becomes rough and vacuum leaks can appear. Enginescope sees it mostly on the M52TU.Appears at around 130,000 km
More faults with the variable valve timing actuator on other engines and cars
- High severityFrequency: OccasionalPorsche V8 and V6 (Cayenne and Panamera)Loosening of the camshaft adjuster boltsPorsche acknowledges that the fixing bolts of the camshaft adjusters on certain Cayenne S and Turbo and Panamera models built up to September 2011 can fail: noise, vibration, engine warning light and, in rare cases, stalling. There has been a worldwide workshop campaign since 2012.
- Medium severityFrequency: CommonM60 and M62Worn seals on the M62 TU VANOS unitOn the M62 TU versions from 1998 onwards, the seals of the intake camshaft VANOS unit harden with age: the engine is noisy when cold, idle becomes uneven and it loses power at mid-range. It is fixed with new seals or a rebuilt unit.
- Medium severityFrequency: CommonBMW N43/N46Wear of the Valvetronic and the VANOS solenoid valvesOver the years, the eccentric shaft or the actuator motor of the Valvetronic can wear and cause heavy idle fluctuations; the VANOS solenoid valves also fail over time, with similar symptoms and a loss of power. According to English-language Wikipedia, the 1.6-litre N43B16 does not have Valvetronic.
- Medium severityFrequency: CommonM111Camshaft adjuster oil leak into the wiringYes: the magnet (solenoid valve) of the M111 camshaft adjuster can lose its seal, and the oil creeps up by capillary action to the connector and the wiring loom. Mercedes-Benz has the same repair cable as for the M271 (part number A2711502733), which is cheap to fit.
- Medium severityFrequency: CommonM271Oil leaking from the camshaft adjuster solenoids into the wiringYes: the camshaft adjuster solenoids (magnets) of the M271 can lose their seal, and the oil wicks up to the connector and the wiring loom, and can even reach the control unit. Mercedes-Benz has a specific repair cable (reference A2711502733) that is cheap to fit.
- Medium severityFrequency: CommonM270/M274Oil leaking from the camshaft adjuster into the electrical connector (M274)Yes: on the M274, the camshaft adjuster solenoids can lose their seal over the years and let oil wick up to the connector and the wiring harness, potentially reaching the ECU. It is fixed relatively cheaply with a specific repair cable.
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Sources
Every fact on this page links to its source. If you find an error, let us know.
- BMW M52 Engine ProblemsBMW Tuning · Technical documentation · consulted 2 November 2026
- BMW M52 Engine: Performance, Reliability, and TuningBMWBlog · Motoring press · consulted 2 November 2026
- BMW M50 / M52: problemas conocidosEnginescope · Other source · consulted 2 November 2026
- BMW Z3 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026
- BMW 5 Series (E39) Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026
- Der BMW M52 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki.de · Other source · consulted 2 November 2026 · in German
- BMW 3 Series E36 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026