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The BMW S58 engine — powering the G87 M2, G80 M3, and G82 M4 — is the first production petrol engine to feature centrally controllable piston cooling. This is not marketing language. It is an engineering distinction that separates the S58 from every other inline-six BMW has built, including the B58TU, and it has direct implications for anyone tuning or building these engines for higher output. At YPG Motorsport, we calibrate S58 engines pushing well beyond factory power targets. Understanding piston cooling control is not optional at those levels — it is the difference between an engine that survives sustained...