09/06/2022
BMW N46B20 common problems
1. High oil consumption. Reasons for this problem are the same as in BMW N42 and it is mainly connected with usage of low quality motor oil. Drivers need to use oil that is recommended by BMW brand. Otherwise it can lead to malfunctions in valve stem seals and later pistons rings can also go out of order. Such problem occurs every 30,000 miles (50,000 km) of mileage.
2. Vibration. You can get rid of this problem after you have your Vanos variable valve timing system cleaned.
3. Noise. Reasons are the same as in N42. They are connected with timing chain tensioner or stretching timing chain. It happens after every 60,000 miles (100,000 km) of mileage.
Pay attention that valve cover gasket may leak every 30,000 miles (50,000 km). In this case you need to change it. In some case replacement of vacuum pump may be necessary.
If you want to prevent any kinds of problems and malfunctions you only need to use high quality motor oil which is recommended by BMW specialists. At the same time you need to proceed with regular maintenance and examinations of your N46B20 engine. If you follow these easy tips you are very unlikely to face any problems for a long time.
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