BMW S38 Engine Guide: Specs, Reliability, and Tuning
In This Article Before turbocharging took over, before variable valve timing became standard, and before BMW’s M division had anything close to a volume playbook, there was the S38. A naturally aspirated inline-six of near-surgical precision, the S38 powered the original M5 and M635CSi through some of the most celebrated years in performance car history. […]
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