S301 — Bmw

B-series are modern modular engines; S-series are M-Division performance engines; M/N-series are older generations.

Earlier E90 versions used a 3.0L inline-six (N52), which might lead to confusion with the "S" (Sport) or "301" designations when searching for older engine parts. s301 bmw

Before we dive deep into the nuance, let's clear up the most common misconception: B-series are modern modular engines; S-series are M-Division

Here is the story of how the BMW 3 Series became the "Ultimate Driving Machine" and the benchmark for performance sedans for over 50 years. The Birth of an Icon B-series are modern modular engines