- 06/17/2019
- 2 Min Read
- By: Evan Madore
BMW E90 335i/xi/is (N54) Turbocharger Replacement - Failures, Fitment, And Product Review
The OEM turbochargers on the BMW N54 engine have multiple methods of failure that are relatively common. Having to replace your failed turbos isn't a small task, so doing so with new OE units the first time is imperative.
Turbochargers on the BMW N54, for the most part, last around 100,000 miles before they have to be rebuilt or replaced. It isn't uncommon to hear of cars that have the original turbos still functioning as designed upward of 200,000 miles. However, failure of the turbos on the BMW N54 is so prevalent that there have been class-action lawsuits as well as service bulletins issued by BMW in response to the failures. Being over twelve years old now, the solutions to these issues, whether extended warranty replacement or other, unfortunately, do not apply.
There are a few signs that the turbochargers on your BMW 335i/xi/is with the N54 engine are due to be replaced. The first and most common sign is loss of power or misfiring due to the wastegate failing. Over time, the wastegate becomes so loose that it allows for boost leaks. When it gets really bad, you will usually notice a distinct rattle or chatter.
Another sign that your turbochargers are on their way out is if you're burning oil resulting in white smoke flowing out of your exhaust. These Mitsubishi turbochargers are oil-lubricated and coolant cooled, so if the seals begin to deteriorate, you'll notice either coolant or oil burning. If that's the case, the turbo is either not receiving adequate cooling or adequate lubrication, with the end result being total failure of that turbo.
If you're in the market for new turbos for your BMW 335i/xi/is, we sell the brand-new OE replacements for the front and rear, rather than the remanufactured units from BMW. And if you're replacing one turbo, we recommend replacing the second turbo while you're there due to the amount of work required to gain access to them. To make the job even easier, we sell an entire installation kit. The kit has everything you need, and want to replace when replacing both turbochargers.
BMW N54 Turbocharger Installation Kit
In the video below, Gareth Foley, our BMW Catalog Manager, walks us through the common failures, symptoms, and why it's vital to replace the turbos if you see signs of failure. If you like this Really Quick Product Review, subscribe and check back here for regular releases in the future.
