M159 hand-built naturally aspirated 6.2L V8

The dry-sump M159 6.2L V8 is the emotional core of the car and, per owners, a genuinely upgraded unit over the more common 6.2 (better pistons/rods). It is hand-assembled one-man-one-engine at AMG, with the builder's signature plate on the intake, and commenters expect it to age well as one of the last big naturally aspirated AMG engines.