In 20222002, BMW M revealed a special V8 prototype engine (full model code ''[[BMW M62#S62|S62B40]]'') for the M3 CSL which was previously fitted to the [[BMW M5#E39|E39 M5]] and the [[BMW Z8|E52 Z8]]. The S62 was BMW's first V8 engine to have [[VANOS#double|double-VANOS]] (variable valve timing on the intake and exhaust camshafts). However, this prototype S62 engine produces {{cvt|316|kW|PS hp|0|abbr=on}} at 6600 rpm and {{convert|500|Nm|lbft|0|abbr=on}} at 3800 rpm. The last difference results in a displacement of {{convert|3999|cc|cuin|1|abbr=on}}, compared with the {{convert|4941|cc|cuin|1|abbr=on}} of the S62 engine found in the M5 and Z8 vehicles.
