M5 Guru (>2000 posts)
Join Date: Nov 2010
Location: Sanborn, NY
Thanked 289 Times in 249 Posts
As far as catastrophic failures in the S63, I'd say it's still the typical internet hysteria. I think part of the problem is that even BMW techs don't realize the total separation of an N63 from an S63, so there is confusion too. A "friend" of mine is a tech at the local dealer. He says they now run a second shift in the shop just so they can keep up with engine replacements (9.9/10 of which are for excessive oil consumption) and he wished me good luck. The thing is, the work they're doing is all on N63 engines, not the S63. When I clarified that to him, he had nothing to say. haha.
Anyway, in my opinion, I'd say the S63 is way better than the S85 you're getting rid of. The S62 is prone to sensor sensitivity and Vanos issues and an overblown rod bearing issue (no pun intend). The S85 has legit expensive repair concerns. The S63 doesn't have too much expensive go wrong with it, at this age anyway. Yeah, fuel injectors and pumps can go but some of that stuff is covered under BMW extended warranty and if not covered, they aren't ridiculously expensive. Of course some people have blown engines. I'd chalk up the majority of those to owners habits and aggressive tuning/mods on the stock bottom end.
2013 M5 Imperial Blue/Silverstone II, 6MT 64k miles
2000 Anthracite daily driver
UUC dssr and shifter
Supersprint headers with Tubi catback
Dinan 3.45 JED lightened flywheel
286,000 miles and counting
'00 Imola/Imola 107k stock
'00 Silverstone/Silverstone 129k (SOLD)