BMW out-of-warranty repair costs are brutal. Water pump on a 328i — $1,100 at the dealer. Parts cost $180. The job takes 3 hours if you know what you’re doing.
The factory manual is what the techs use. Coolant bleed procedure, thermostat housing torque spec, serpentine belt routing — it’s all in there. No guessing, no stripped bolts from wrong torque values.
BMW also doesn’t publish free service info online. The OEM manual is genuinely the only way to get factory specs without paying dealer labor rates just for an answer.
2014 BMW 328 factory manual — covers the N20 and N26 engines. Other years on the site too.