Early 318i four-cylinder models with M43 (1.9-litre) engines are generally reliable.
Later four-cylinder models with N42 and N46 engines (318i) can suffer from problems with the variable valve timing system, timing chain tensioners, vacuum pumps, and may burn oil due to worn valve stem seals or piston rings.
M52 engine (323i, 328i) can consume oil due to engine wear or PCV system components. M54 engine (320i, 325i, 330i) can have issues with piston rings requiring an expensive engine overhaul.
S52 engine (M3) also suffer from variable valve timing system issues and rod bearing failure can occur, although not as common as later "M" engines.
All engines use timing chains and most models require premium unleaded.
There have been reports of the chassis cracking, particularly on early 6 cylinder models.
Some late model coupes and convertibles had an SMG transmission (a type of semi-automatic transmission). These have proved to be problematic and expensive to repair.
Image credit: OSX, Public domain, via Wikimedia Commons
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