Why do N55s fail?

Voodoo18 · 09-26-2023, 07:35 PM

Interesting watch

TL;DW.....FF to 44:12 to get the answer to this engine.

TurboWeasel · 09-27-2023, 08:22 AM

Bad design in that case then. Aluminium bolts should only be used in areas of low stress, such as oil pans.

Orion4 · 09-27-2023, 07:53 PM

That is a very poorly maintained engine! Actually- Gross. I find the N55 to be very reliable. If you have the common sense to do the modicum of preventive maintenance. My current N55 is in a 2013 F30 and is doing quite well, thank you, at 208,450 miles. Oil and filter every 7500 miles. Only engine related off normal service was a valve cover at 74, 530 (CCV) and OFHG at 47, 400.

arekuf3x · 09-27-2023, 11:54 PM

N55 can easily last 300k+ mi with proper maintenance. Most of them die because of oil starvation, poor maintenance.

09-26-2023, 07:35 PM	#1
Voodoo18 Private 23 Rep 66 Posts Drives: 440i, GT350, MDX, SL55, Blazer Join Date: Apr 2022 Location: Pittsburgh iTrader: (0)	Why do N55s fail? Interesting watch TL;DW.....FF to 44:12 to get the answer to this engine.
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09-27-2023, 08:22 AM	#2
TurboWeasel Major 835 Rep 1,068 Posts Drives: BMW 330D Join Date: Nov 2022 Location: UK iTrader: (0)	Bad design in that case then. Aluminium bolts should only be used in areas of low stress, such as oil pans.
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09-27-2023, 07:53 PM	#3
Orion4 Lieutenant Colonel 481 Rep 1,574 Posts Drives: 2013 335i Sport Line Sedan Join Date: Aug 2009 Location: Melbourne, FL iTrader: (0)	That is a very poorly maintained engine! Actually- Gross. I find the N55 to be very reliable. If you have the common sense to do the modicum of preventive maintenance. My current N55 is in a 2013 F30 and is doing quite well, thank you, at 208,450 miles. Oil and filter every 7500 miles. Only engine related off normal service was a valve cover at 74, 530 (CCV) and OFHG at 47, 400.
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09-27-2023, 11:54 PM	#4
arekuf3x Private 84 Rep 93 Posts Drives: 335i, X5 Join Date: Feb 2023 Location: US, California iTrader: (0)	N55 can easily last 300k+ mi with proper maintenance. Most of them die because of oil starvation, poor maintenance.
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