Anyone have a favorite BMW straight-6? Optional questions in description.

* Most reliable or least reliable?

* Most DIY or least DIY friendly?

* Best sounding?

* ownership experience?

* Strengths and weaknesses of a certain engine?

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• BMW M78 (1933–1936)

• BMW M328 (1936–1940)

• BMW M337 (1952–1958)

• BMW M30 (1968–1994)

• BMW M20 (1977–1993)

• BMW M21 Diesel (1983–1991)

• BMW M50 (1990–1996)

• BMW M51 Diesel (1991–2000)

• BMW M52 (1994–2001)

• BMW M54 (2000–2006)

• BMW M57 Diesel (1998–2013)

• BMW N52 (2004–2015)

• BMW N53 (2006–2013)

• BMW N54 (2006–2016)

• BMW N55 (2009–2018)

• BMW B57 Diesel (2015–present)

• BMW B58 (2015–present)

• BMW M88 (1978–1981)

• BMW S38 (1984–1995)

• BMW S50 (1992–2000)

• BMW S52 (1996–2001)

• BMW S54 (2000–2006)

• BMW S55 (2014–2020)

• BMW S58 (2019–present)