"Is the 3 Serisi 330i reliable, and what should you check?"
The most commonly reported issue when buying a used BMW 3 Series 330i 2017 (F30 / F31 / F34 / F80 / LCI): Oil consumption and leaks. Timing chain/tensioner noise (rattling) is also frequently reported.
Engine: B48
B48B20B · 330i · Used in this car from 2015-2020
Known engine issues
Cooling systemEarly versions of this engine were equipped with short-lived cooling system pipes that often burst, but later plastic was replaced with rubber and the problem went away. Also on the forum they often complain about the short-lived water pump, radiators and coolant expansion tank cap.
Oil consumptionCompared to its predecessors, B48 units are not as prone to oil consumption, but closer to 100,000 km the valve stem seals usually harden and consumption appears. Also worth noting are regular leaks from the oil filter housing, it needs to be monitored.
Floating idleFloating idle speed or regular appearance of lean mixture errors indicate failure of the fuel tank ventilation valve. But it is inexpensive.
+2 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Oil consumption and leaks
Often reported
Many users and technical reports indicate higher than normal oil consumption and localized leaks at seals (valve cover, oil filter housing) on the 2.0 B48 engine in the 330i F30 LCI.
Engine Bay
Timing chain/tensioner noise (rattling)
Often reported
Some B48 engines report rattling noises from timing drive components on cold start or at low RPM.
Timing chain
Turbo and wastegate problems
Often reported
Wastegate rattle and turbocharger issues causing power loss and occasional oil leaks from the turbo area are reported.
Turbo
BMW 3 Serisi 330i technical specs
BMW 3 Serisi 330i (2017): boot 480 L; fuel use 6,1 l/100 km (urban 7,9 l/100 km · extra-urban 5,1 l/100 km); 0–100 in 5.9 s.
Boot capacity
480 L
Fuel consumption
6,1 l/100 km (urban 7,9 l/100 km · extra-urban 5,1 l/100 km)
What to look for when buying a BMW 3 Series 330i?+
When buying a 2017 330i, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: oil consumption and leaks; timing chain/tensioner noise (rattling); turbo and wastegate problems.
What are the common problems of the BMW 3 Series 330i?+
Most commonly reported issues: oil consumption and leaks; timing chain/tensioner noise (rattling); turbo and wastegate problems.
Is the BMW 3 Series 330i reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 3 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.