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Old 06-22-2023, 11:39 AM
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To buy or not to buy, thatís the question.

Iím looking at a 2011 e70 3.5i with 103K on the Odo. Itís priced right, and drives great. However, in 2021 it had the oil pump replaced. I called the shop and they said the owner brought it in for a low oil pressure warning, and they replaced the sensor and finally the oil pump. This would be my first experience with the N55 engine, and Iím curious what yíall thing about how bad for the engine the (I can only assume) couple weeks of running it with low oil pressure will have been for it. On other forums Iíve read several horror stories of rod bearing failures directly related to very short term oil starvation.
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Old 06-22-2023, 02:51 PM
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You'd have to take the bearing caps off to know that's a pretty big effort.

If you have time you can get an oil sample tested that would be what I would do.

If the price was right and an audio recording and knock sensors find no significant issue and of course you can't hear any knock at all, I would buy the car. I would pay more if they would let me get the oil tested first. Less if not but passed all the tests above.

It's not difficult to replace the rod bearings on n55. My x5 is at 170k and I'm aiming to preemptively replace them before 200k. Prob summer 24 since summer 24 doing valve cover.

The week oil pressure for a couple weeks acutally is a sign it was low not nonexistent. Don't know the history of the car but it sounds like the classic serpentine belt ingestion issue.
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Old 06-22-2023, 10:29 PM
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Thanks for the reply! No knock sensor issues and all sounded good, just the injectors being louder than the ones on my m54. But I listened to a bunch of YouTube videos of a normally running N55 and thatís what it sounded like. So fingers crossed. I got it for cheap enough I could almost replace the engine and come out even if worst came to worst. Anyhow I went ahead and pulled the trigger. Gonna pick it up tomorrow.
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Old 06-25-2023, 01:40 AM
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N55 and even n52 make a lot of injector ticking. Mechanic stethoscope is very helpful to listen for both top and bottom drive train parts
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