When it comes to BMWs, the best seller is definitely the 3 Series. This model is the most popular out there with millions of units sold from each generation.
This car is perfect for those who want to own a luxury brand at a good price point. Not to forget the excellent driving dynamics that the model offers. Making it easily one of the best choices.
However, not everything is sunshine and rainbows, there are also BMW 3 Series issues that you need to be aware of. This is why in this guide, we cover all you need to know when it comes to BMW issues 3 Series!
Overview of BMW 3 Series Reliability
BMW is one of the brands that invest a lot in the development of each model. When you get a BMW, you get what you pay for. However, there are also reliability problems, just like with any car. This aspect depends on the generation, engine type, as well as maintenance.
Are BMW 3 Series Reliable Long-Term?
The answer to this question really depends on the engine. When properly maintained, every 3 Series should squeeze at least 150,000 miles.
However, issues with certain engines are common. Especially 4-cylinder engines are a bit less reliable than the inline-6 engines in terms of longevity.
Also, issues with BMW 3 Series tend to increase as the model ages. Common problems include oil leaks and coolant leaks.
Models and Years with the Most Reported Issues
So, what are the worst model years of the BMW 3 Series? Common issues with BMW 3 series appear more often in certain model years.
Specifically, the F90 model built between 2006 and 2011 had a very high number of electrical and engine cooling issues.
The F30 that followed the F90 is also prone to these issues but a bit more refined. So, fewer of these problems appeared. However, the N20 and N26 engines used in this generation were very poor and suffered from many problems, with the timing chain mechanism failing.
Models post-2019 built on the G20 platform show big improvements in terms of reliability. However, owners still reported some issues with the BMW 3 Series like electrical problems and sensor glitches.
Most Common BMW 3 Series Issues
Here are some of the most frequently reported BMW 3 Series issues that often appear above 60,000 miles. These issues are common to any BMW as it starts to show its age.
Engine Overheating Problems
One of the most common BMW 3 Series issues that owners face is overheating. Overheating is often caused by poor cooling system design in many of these models.
These models are often driven hard and the stock cooling system is not good enough. So, overheating is often a huge problem for owners who want to drive their BMW very hard.
Other things that can cause overheating include driving in congested traffic, a bad thermostat, or a bad water pump. Some BMW 3 Series have poorly designed water pumps that often leak and fail.
Oil Leaks
Oil leaks are also one of the most common issues with BMW 3 Series. BMWs love to leak oil from every gasket and seal.
The problem might be simple, but if not detected and fixed, you can starve the engine of oil, and this will create heat spots that will make it fail sooner than expected.
If you notice leaks, you should replace the gasket or seal on time in order to avoid such repercussions.
Cooling System Failures
The cooling system in BMW models of the 3 Series is not one of the best. The hoses and fittings tend to crack and fail. Coolant leaks will start to appear and you can lose some serious amount of antifreeze.
Especially if it's an older BMW, it is recommended that you perform a refresh of the whole cooling system.
This would involve the replacement of the hoses, as well as the cleaning of the radiator and expansion tank.
Timing Chain Rattle (N20/N26 Engines)
One of the most notorious issues with BMW 3 Series that comes with the BMW N20 or N26 engines is the timing chain rattle.
The chain mechanism on these engines is not one of the best in the world. In many engines, the chain mechanism starts to fail prematurely and rattle. All this because of a bad tensioner.
The solution is to replace the timing chain, guides, and tensioner before it fails. If the chain completely fails, the engine will seize. Then, you will need to perform an engine rebuild or buy a new engine.
Electrical System Glitches
Electrical problems are also very common. Especially on the E90 and F30 models. Usually the door locks malfunction, there are flickering lights, and dashboard warnings for no particular reason. These issues are mainly triggered by the 12v battery. These cars do not like to run on a weak battery.
How to Prevent Common BMW 3 Series Problems
Follow a Strict Maintenance Schedule
Regular oil changes every 5,000 miles are your best bet. Don’t wait to reach 10,000 or 15,000. The more regular oil changes the better. Also, invest in replacing other fluids like the coolant, and brake fluid. Always use quality parts for any maintenance procedure.
Use a Factory Service Manual for Accuracy
An original factory service manual is also very handy. In this manual, you have the right guidance to tackle any maintenance job with ease. Also, troubleshooting problems is a breeze if you have the right manual.
Watch for Warning Signs and Fix Early
Learn the common issues with BMW 3 Series models and try to detect if you have one of these problems. Check for oil leaks, and check if the temperatures are good. This way, you will prevent most of these common problems.
Conclusion
Overall, the BMW 3 Series is a blast to drive but this car also requires regular upkeep. You need to be aware of its common problems and detect these problems on time.
By doing so, you can maximize the reliability of your BMW and extend its life. Preventive maintenance is the best approach when it comes to BMWs. Use quality parts and fluids. Most importantly, use an original repair manual to guide you through every maintenance and repair procedure!