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BMW S38 Engine Guide: Specs, Reliability, and Tuning

Summary by BMW BLOG
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. It was — and in many ways still is — everything a driver’s engine should be. This is the definitive guide to…
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BMW BLOG broke the news in on Tuesday, February 24, 2026.
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