Originally Posted by FormulaMMM
I personally would not do that swap. There is some precedent for running the S62 in the E9x platform though. Turner does it in their Rolex M3s -- http://www.turnermotorsport.com/race-cars.aspx
I owned an E39 M5 for 3 years, and had both my M5 and E90 M3 for a few months.
Fundamentally different engine characteristics, both awesome. I can see having a preference for either.
Gun to my head I'll take the S65 because of the excitement factor. Nothing the S62 delivers can match the thrill of power building to 8400 rpm, IMO.
On a side note, I've never experienced an engine that loved the cold like the S62. Felt closer to 500 hp than 400 in freezing temps and below.
As far as reliability, in my experience both are bulletproof. (My M5 was a 4/03 build.)
Thanks for the response, again I was curious because these are the only 2 n/a production ///M V8's thus far... So its cool to see objective feedback, as opposed to the hate I was reading. A simple google search will return the the results of what I am speaking of. Also know that I have alot of respect for the E39 in general. I actually bought a new E39 528i Sport in 1998, so I am aware of the inherent goodness of the platform. Even today, I wouldn't mind owning an E39 M5 - in addition - to an E92 M3.