The E46 3-Series with M43/N42 fours, the M52/M54 sixes and M47/M57 diesels. The six-cylinder cooling system and (on Valvetronic N42) the eccentric-shaft/valvetronic items are the usual watch-points. Editorial summary, not a reliability rating; per-configuration facts and their evidence are below.
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Filtered: M47 · 2.0L diesel (M47).
Known issues
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Engines & reliability
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Pre-purchase checklist
Maintenance
Key service intervals — vary by engine and driving conditions.