BMW Z4 E85/E86 N52 / N53 problems
The BMW Z4 E85/E86 used the N52 / N53 from 2004 to 2008 (Z4 2.5i and Z4 3.0i). 4 documented faults affect it; the most important is “electric water pump and thermostat failure” (medium severity, common). Our verdict: “With caution”. It is the safest option among the documented engines of the BMW Z4 E85/E86.
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Engine score on this car
6.5 out of 10Acceptable reliability
Only counting the faults that affect the versions and years of the Z4 E85/E86. How we calculate it
Overall score for the BMW Z4 E85/E86
6.4 out of 10Acceptable reliability
Engines, gearbox, suspension, brakes, electronics and the rest of the car. See breakdown
BMW N52 / N53
Safest optionBMW N52 and N53 (seis cilindros atmosférico) · Petrol
- Names
- Z4 2.5i · Z4 3.0i
- Faults that affect it
- 4
Verdict for the versions it uses
N52B25 2.5 (2004-2015)2004–2015 · 174–215 hp · N52B25
With cautionAn engine considered very reliable for a BMW, but with known weak points (water pump, oil seals, valve cover) that are best seen to have been dealt with already.[1][3]
N52B30 3.0 (2004-2015)2004–2015 · 215–268 hp · N52B30, N51B30
With cautionSame weak points as the N52B25; units from before the end of 2008 may have noisy hydraulic lifters.[1][3]
Faults that affect the Z4 E85/E86
Only those that affect the versions and years that this car used. The BMW N52 / N53 has 6 documented faults in total.
- Medium severityFrequency: CommonCoolingElectric water pump and thermostat failureThe N52's plastic electric water pump cracks or fails sooner than a mechanical one, and the thermostat usually goes with it; it is recommended to replace it as a precaution at around 80,000-100,000 km.Repair (garage): €350–€600Appears at around 80,000 km
- Medium severityFrequency: CommonLubricationOil leak from the oil filter housing gasketThe oil filter housing gasket hardens over time and leaks oil on all N52 engines; the leak can soil the engine and damage nearby parts.
- Low severityFrequency: CommonLubricationValve cover and crankcase ventilation valveThe N52's plastic valve cover cracks with heat cycles and the crankcase ventilation system fails, causing whistling, leaks and oil consumption.Repair (garage): €200–€350
- Low severityFrequency: OccasionalLubricationN52 hydraulic lifter noiseN52 engines from before December 2008 can have hydraulic lifters that make a tapping noise when cold because of a lubrication problem.
What to check before buying a used BMW Z4 E85/E86 N52 / N53
Each point comes from a documented fault that affects this car. You can tick them off as you inspect it.
If it has the BMW N52 / N53 (2004–2008)
Electric water pump and thermostat failure
Medium severityOil leak from the oil filter housing gasket
Medium severityValve cover and crankcase ventilation valve
Low severityN52 hydraulic lifter noise
Low severityOther engines and gearboxes of the BMW Z4 E85/E86
Score for each one with the faults that affect this car, from best to worst.
Faults of the BMW Z4 E85/E86 outside the engine
Suspension, brakes, electronics and the rest of the car: they occur with any engine.
- Medium severityFrequency: OccasionalBodywork and interiorElectric hood motor and mechanism failureAccording to the reports collected by fiches-auto.fr, the electric hood on the Z4 E85 is the most frequently cited fault outside the engine: 13 of 78 reports mention a failed motor, jamming or water drainage problems, between 100,000 and 220,000 km.
- Medium severityFrequency: OccasionalGearbox and clutchPremature clutch wear and slipping when hotAccording to the reports collected by fiches-auto.fr, 5 of 78 Z4 E85 owners cite clutch faults, with slipping when hot or problems engaging gear, from around 150,000 km. No cost is given.
- Medium severityFrequency: OccasionalGearbox and clutchNoises and difficulty engaging gears in the manual gearboxAccording to the reports collected by fiches-auto.fr, 7 of 78 Z4 E85 owners cite noises or difficulty engaging gears in the manual gearbox and 2 more cite differential faults, between 65,000 and 258,000 km.
Buying a BMW Z4 E85/E86 N52 / N53?
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Frequently asked questions
Is the BMW Z4 E85/E86 N52 / N53 reliable?
The BMW Z4 E85/E86 used the N52 / N53 from 2004 to 2008 (Z4 2.5i and Z4 3.0i). 4 documented faults affect it; the most important is “electric water pump and thermostat failure” (medium severity, common). Our verdict: “With caution”. It is the safest option among the documented engines of the BMW Z4 E85/E86.
What faults does the BMW Z4 E85/E86 N52 / N53 have?
The documented ones that affect this car are: electric water pump and thermostat failure (medium severity), oil leak from the oil filter housing gasket (medium severity), valve cover and crankcase ventilation valve (low severity) and n52 hydraulic lifter noise (low severity).
Which engine should you choose for the BMW Z4 E85/E86?
None has a «Buy» verdict; the safest option is the BMW N52 / N53, with a «With caution» verdict.
Own a BMW Z4 E85/E86 N52 / N53? Tell us what faults you have had and at how many kilometres. Report your fault.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- BMW N52 Engine ProblemsBMW Tuning · Other source · consulted 5 October 2026
- BMW N52Wikipedia · Other source · consulted 5 October 2026
- These BMW N52 Years Have The Most ProblemsJalopnik · General press · consulted 5 October 2026
- Problemas BMW N52Total Renting · Other source · consulted 5 October 2026 · in Spanish