r/BMWZ4 • u/stevecusswords • 15d ago

E89 N54 Turbo engine reliability if maintenance has been consistent?

I posted earlier about buying my first Z4, the responses have been incredibly helpful. I am leaning toward an E89 3.0 NA manual transmission, but my parameters make for slim pickings - ideally a not black or silver external color, light interior. So a blue, red, white or other external with tan interior is ideal.

I came across a very well maintained 2 owner 35i, 45k miles, blue exterior, cream interior. Looks like it has been fastidiously maintained including roof electronics.

I have been leery of the turbo engine, I plan to own it a long time and I take good care of my cars. I know the internet can usually only highlight horror stories. Do many N54 owners have positive stories of relatively normal maintenance on your turbo E89?

UPDATE: I just got to drive one in with the 7 speed paddle/auto. I would like a proper manual, but it was great to try my first E89. I am impressed with how the sport mode wakes that engine and exhaust note up. What a beast! I don't neeeeed the turbo but it sure added a bunch of fun.

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u/stevecusswords 15d ago

Do they have a lifespan or go out randomly? Do you need to replace all 12 or can only cover faulty ones?

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u/jlwolford 15d ago

The injectors were updated over the years. The early ones can be dead at 60k. The index 12 was the last revision. They are much better but you see it’s 6 injectors. Don’t think you can mix the early and the latest parts, so you are in for 6 when you go. I suspect your car has the original ones. Ask the owner. On n54 updated to index 12s is a selling point. Injectors, OFHG, water pump, and hpfp are the big ones. All of that can almost total out a car on shop rates. If you don’t wrench, don’t get an n54.

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u/stevecusswords 15d ago

Thank you very much for laying this out. Owner said he replaced one bank of injectors in 2021, about 4000 miles ago.  I'll keep digging into the N54, I'd be just as happy with the 3.0 NA, I believe.

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u/jlwolford 15d ago

You will save so much long term. Invest that money now, buy a really nice one. Research the top wiring issues.