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Hey OP did you ever get the car?
I had an e92 with n54 engine and kept it until it had 80k miles. Traded it in cause I needed 4 doors. Still miss that car.
Problems I encountered:
1. hpfp replaced at 15k and 60k - both under warranty
2. needed walnut blasting at 50k - developed misfires and walnut blast cured it - covered under cpo at the time
That's about it. No water pump or oil filter housing gasket issues for me but these are definitely issues for most bmw's. I just did the recommended maintenance for oil, filter, brake fluid, plugs, etc.
Check the ofhg for leaking and the brakes. Brakes are expensive on these cars. Find out if the car has had walnut blasting. If it hasn't, plan on doing it - knock another $400 off the price.
The hpfp is covered on the n54 for 10yrs or 120k miles
I believe the 09 had the better waste gates so turbos shouldn't be an issue
Just set aside about $2-3k for unexpected stuff and have fun.
I have been daily driving (about 15k per year) a 135 for past 3 yrs and love it. No extended warranty for me.
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