"Is the 4 Serisi 428i reliable, and what should you check?"
When buying a used BMW 4 Series 428i 2016 (F32 / F33 / F36 / F82 / F83), the most frequently mentioned issue is oil leaks and excessive consumption. Additionally, ignition coils and misfires are also commonly reported.
Engine: N20
N20B20A · 428i · Used in this car from 2013-2016
Strengths
Relatively low fuel consumption
Good potential for chip tuning
Watch-outs
Timing chain has low service life
Frequent leaks from under valve cover
Plastic pipes have short lifespan
Known engine issues
Timing chainThe most famous weak point of this engine is the modest service life of the timing chain, sometimes it lasts less than 80,000 km. Note that units after 2015 have a longer service life.
Oil pump chainAnother widespread problem of early engines was the breakage of the oil pump chain with fatal consequences. A new thicker chain appeared in September 2012.
Piston destructionN20B20A engines with compression ratio 10.0 are easily tuned and run without much trouble, but N20B20B engines with compression ratio 11.0 suffer from detonation after chip tuning.
Listed from most frequently reported, each with its source.
Oil leaks and excessive consumption
Often reported
Oil leaks from the valve cover gasket, oil filter housing gasket, and other seals. Abnormal oil loss can worsen lubrication of the chain and other components.
Engine Bay
Ignition coils and misfires
Often reported
Italian owners report failures in ignition coils and sometimes spark plugs, leading to rough idle, power loss, check engine light, and misfire issues. Replacing the coil or plug usually resolves the problem.
Engine Bay
Carbon buildup on intake valves
Often reported
Carbon buildup on intake valves is common in direct injection engines; this can cause sluggish response, rough idle, and power loss, especially with city driving or frequent cold starts.
Engine Internal
Timing chain and guides
Often reported
The N20 engine is known for premature wear of plastic timing chain guides and tensioner, causing noise and potential chain slip.
Engine Internal
Turbo and wastegate issues
Often reported
Some examples report turbocharger-related noises and failures, particularly wastegate rattle or actuator problems.
Turbo
BMW 4 Serisi 428i technical specs
BMW 4 Serisi 428i (2016): boot 445 L; fuel use 6,7 l/100 km (urban 8,9 l/100 km · extra-urban 5,3 l/100 km); 0–100 in 5.9 s.
Boot capacity
445 L
Fuel consumption
6,7 l/100 km (urban 8,9 l/100 km · extra-urban 5,3 l/100 km)
What should I look for when buying a BMW 4 Series 428i?+
When buying a 2016 428i, check the service history, test drive, and engine/transmission warnings. The most commonly reported issues are: oil leaks and excessive consumption; ignition coils and misfires; carbon buildup on intake valves.
What are the chronic problems of the BMW 4 Series 428i?+
The most commonly reported issues are: oil leaks and excessive consumption; ignition coils and misfires; carbon buildup on intake valves.
Is the BMW 4 Series 428i reliable?+
Instead of a simple yes/no, it's necessary to evaluate 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; the source vehicle and target vehicle are verified for brand, fuel, engine, and generation compatibility. Topics with insufficient evidence are not shown.