"Is the 5 Serisi 525d reliable, and what should you check?"
When buying a used BMW 5 Series 525d 2018 (G30 / G31 / F90), the most frequently mentioned issue is timing chain wear / noise. Also, DPF clogging / incomplete regenerations are commonly reported.
Engine: B47
B47D20B · 525d · Used in this car from 2018-2020
Known engine issues
EGR valveMost problems of this engine are related to the EGR system, called AGR here. In early years, the valve could clog at 30,000 km and a recall campaign was even conducted. When it sticks open, overheating causes the intake manifold to crack.
Intake cloggingThe second most frequent service issue is clogging of the intake manifold and ports in the cylinder head, leading to loss of power and unstable engine operation. In severe cases, the intake swirl flaps may stick and break off.
Timing chain stretchThe chain timing drive on B-series engines differs little from N-series predecessors and may require attention before 200,000 km under very active use. There is already a cost-effective procedure to replace these chains without removing the engine.
+1 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Timing chain wear / noise
Often reported
In some B47 engine examples, abnormal elongation or noise from the timing chain and related tensioners has been reported.
Timing chain
DPF clogging / incomplete regenerations
Often reported
The diesel particulate filter (DPF) is sensitive to city driving and short trips; this can prevent proper regenerations, leading to incomplete regenerations, increased exhaust back pressure, and warning lights. In severe cases, forced regeneration may be required.
Exhaust Emissions
Clogged EGR or EGR system failure
Often reported
In modern diesel engines like the B47, the EGR valve and EGR cooler can accumulate carbon deposits, reducing exhaust gas recirculation flow, causing power loss, increased fuel consumption, rough running, and the check engine light to come on.
Exhaust Emissions
Injectors / common-rail system issues
Often reported
Issues with high-pressure injectors (common-rail) have been reported in modern diesel engines, causing power loss, increased fuel consumption, rough running, and starting difficulties.
Fuel System
Faulty turbo / supercharger
Often reported
Bearing or shaft wear can occur in the turbo, leading to boost loss, abnormal noises (whistling or metallic sounds), and performance drop. In case of mechanical damage, debris can contaminate the lubrication circuit and damage the engine.
Turbo
BMW 5 Serisi 525d technical specs
BMW 5 Serisi 525d (2018): boot 570 L; fuel use 5,1 l/100 km (urban 5,7 l/100 km · extra-urban 4,8 l/100 km); 0–100 in 6.8 s.
Boot capacity
570 L
Fuel consumption
5,1 l/100 km (urban 5,7 l/100 km · extra-urban 4,8 l/100 km)
What should I look for when buying a BMW 5 Series 525d?+
When buying a 2018 525d, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: timing chain wear / noise; DPF clogging / incomplete regenerations; clogged EGR or EGR system failure.
What are the chronic problems of the BMW 5 Series 525d?+
Most commonly reported issues: timing chain wear / noise; DPF clogging / incomplete regenerations; clogged EGR or EGR system failure.
Is the BMW 5 Series 525d reliable?+
Instead of a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 5 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from the Difetti fault database records; compatibility between the source vehicle and target vehicle is verified by brand, fuel, engine, and generation. Topics with insufficient evidence are not shown.