"Is the 5 Serisi 525d reliable, and what should you check?"
When buying a used BMW 5 Series 525d 2017 (G30 / G31 / F90), the most frequently mentioned issue is timing chain wear / noise. Also, DPF clogging / incomplete regenerations are commonly reported.
Engine: N47
N47D20D · 525d · Used in this car from 2012-2017
Strengths
Wide selection of versions and modifications
Economical for such power output
Watch-outs
Many problems with early diesel versions
Frequent oil leaks
Many versions have piezo injectors
Known engine issues
Timing chain driveEarly engines had low timing chain lifespan: guides wore out, chains stretched, and sharp teeth on the crankshaft sprocket accelerated the process. On updated N47TU or N47N engines, most weak points were eliminated.
Cracks in the blockThe aluminum block was initially designed without a special safety margin, and severe overheating could cause cracks between the second and third cylinders. With the update, the block was reinforced and such problems almost ceased.
Fuel systemAll engines in this series are equipped with a reliable Bosch Common Rail fuel system, but powerful versions with piezo injectors are quite demanding on fuel quality. Also, avoid driving with an empty tank, as the high-pressure pump may suck in air and start producing metal shavings.
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
Problems 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 (2017): boot 560 L; fuel use 5,6 l/100 km (urban 6,6 l/100 km · extra-urban 4,9 l/100 km); 0–100 in 7.2 s.
Boot capacity
560 L
Fuel consumption
5,6 l/100 km (urban 6,6 l/100 km · extra-urban 4,9 l/100 km)
What should I look for when buying a BMW 5 Series 525d?+
When buying a 2017 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 necessary to evaluate proven pros and cons together. This page lists 5 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; brand, fuel, engine, and generation compatibility between the source vehicle and target vehicle are verified. Topics with insufficient evidence are not shown.