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paulbiche
Fixedwheelnut
@paulbiche pretty much, I am not a fan of 4 cylinder engines after the M44 all N series engines seem to suffer chain issues of some sort, Valvetronic engines are also prone to finger wear in the valve train that can be expensive.
The M54 6 cyl is a reliable lump, they can suffer with water pump and vanos trouble but other than that pretty good.
Hackengineering do a good modified vanos service with improved machined components if ever you do get trouble.
https://www.hackengineering.co.uk/