"Is the 6 Serisi 630d reliable, and what should you check?"
Most commonly reported issue when buying a used BMW 6 Series 630d 2020 (F06 / F12 / F13 / LCI): Timing chain slack (rare). Also, NOx/AdBlue sensors and SCR system failures are frequently reported.
Engines available in this year
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Timing chain slack (rare)
Often reported
The B57 engine has a more robust chain compared to older BMW diesels, but high mileage or poor maintenance can cause wear on the timing chain or guides, leading to noise on cold start and risk of serious damage.
Timing chain
NOx/AdBlue sensors and SCR system failures
Often reported
On B57 engines, the SCR and AdBlue system may experience NOx sensor failure or AdBlue supply issues, leading to emission errors, warning lights, and power limitation.
Exhaust Emissions
Diesel Particulate Filter (DPF) clogging
Often reported
In the modern 3.0 B57 engine of the 630d, the DPF can clog if the car is mostly used for short trips or city driving, preventing effective regeneration.
Exhaust Emissions
EGR carbon buildup and failure
Often reported
On the B57 engine, the EGR valve and cooler can accumulate soot and carbon deposits, causing rough idle, unresponsiveness, and increased emissions.
Exhaust Emissions
Oil leaks and turbocharger issues
Often reported
Some examples of the six-cylinder diesel engine report oil leaks from turbo oil lines/hoses and turbocharger wear or failure.
What should I look for when buying a BMW 6 Series 630d?+
When buying a 2020 630d, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: Timing chain slack (rare); NOx/AdBlue sensors and SCR system failures; Diesel Particulate Filter (DPF) clogging.
What are the common problems of the BMW 6 Series 630d?+
Most commonly reported issues: Timing chain slack (rare); NOx/AdBlue sensors and SCR system failures; Diesel Particulate Filter (DPF) clogging.
Is the BMW 6 Series 630d reliable?+
Instead of a simple yes or no, it's better 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 Difetti fault database records; the source vehicle is verified for brand, fuel, engine, and generation match with the target vehicle. Topics with insufficient evidence are not shown.