[maddmatth]

Hi,

My car is an 2010 E92 335i with N55 and DCT (2010 Euro model year, US would label it a 2011 I guess).
Engine has completely seized up on a trackday...

So far I have some quotes for replacement engines. One is from a 2015 435i.
Would that be a straight swap? What are things to look out for there? I know the F series engines have differences, including a different ECU. Would that still be compatible with a DCT transmission?

I am leaning towards an engine from a wrecked E series 135i as it's much cheaper, but the 435i engine is near new with something like 18 000km.

The 135i is 90000km, which is half my car's mileage so that's still not bad, if I get this one I think I'll get new rod bearings and baffling in the oil pan to make it more durable on a track.
But maybe there are some good reasons to pay more for the F series engine?

Any thoughts or advice from members here? Who has swapped in an F series engine and how did it work out?