The AMG models sit above the SL550: the SL63's window sticker shows 577 hp and owners call it 'bonkers,' while the twin-turbo V12 SL65 is rare and valued far higher, with low-mile examples selling from roughly $86k to $140k. AMG owners prize the SL65 motor as something the current SL no longer offers, and note these AMGs rarely appear at low mileage.
SL63 and SL65 AMG variants: power, rarity and values
Mercedes-Benz SL (R231) · market